JUSTICE APPLETON delivered the opinion of the court:

A jury found defendant, Brian S. Peacock, guilty of home invasion (720 ILCS 5/12-11(a)(2) (West 2002)), aggravated battery (720 ILCS 5/12-4(b)(1) (West 2002)), and domestic battery with a previous domestic-battery conviction (720 ILCS 5/12-3.2(a)(1) (West 2002)). The trial court sentenced him to concurrent terms of imprisonment. The sentences on the latter two convictions were extended terms.

Defendant appeals on five grounds. First, he argues his convictions violated the one-act, one-crime rule. Second, the extended-term sentences were unauthorized by statute and, therefore, void. Third, the domestic-battery statute (720 ILCS 5/12-3.2(a)(1) (West 2002)) is unconstitutionally vague as applied to him. Fourth, the trial court failed to inquire into his pro se posttrial allegations of ineffective assistance of counsel. Fifth, he was entitled to an additional 21 days of presentence credit.

We find no violation of the one-act, one-crime rule. We find no vagueness in the domestic-battery statute. We agree, however, with defendant's remaining contentions. Therefore, we vacate the extended-term portions of the sentences for aggravated battery and domestic battery, we grant 21 additional days of presentence credit, and we remand this case with directions to issue an amended judgment at sentence and to perform the preliminary investigation required by People v. Krankel, 102 Ill. 2d 181, 464 N.E.2d 1045 (1984), and its progeny.

The evidence at trial showed that defendant and Kelly Slade had been dating off and on for about eight years. In the summer of 2002, they became engaged, but Slade broke off the engagement some months before the incident in this case. Defendant still overnighted at her apartment now and then and used it as his mailing address, but he did not live there.

Late at night on October 19, 2002, Slade was asleep in her apartment when she was awakened by a telephone call. It was defendant, and he wanted to come in. She rose from the couch and looked through the peephole of her door: defendant was standing in the hall. She refused to let him in and told him to go away. He called back immediately, and while she was on the line with him, he removed the screen of a living-room window and climbed into her apartment.

Defendant snatched the telephone out of Slade's hand, threw it across the room, and yanked the telephone cord out of the wall. Then he proceeded to administer a beating that, according to Slade, lasted about two hours. He punched and slapped her in the face. He dragged her by the hair and kicked her in the arms and legs. He choked her with his hands and with a towel, telling her he loved her and wanted to marry her and would not let her break up with him. At some point, he picked up her son's aluminum baseball bat (her son was staying overnight at a friend's house) and hit her in the arms, legs, and stomach with it--not "full blows" but hard enough to "get [her] attention" and inflict pain--all the while telling her the "[s]ame stuff": "[']I love you. You can't do this to me. Don't leave me.[']" Eventually, Slade persuaded him to desist from beating her by saying she needed to go the emergency room. He reluctantly agreed to let her go on condition that she not report him to the police. The jury found defendant guilty of all three counts of the information.

On May 28, 2003, after conviction but before sentencing, defendant filed the following letter:

"Judge Ford[,]

My name is Brian Scott Peacock. [M]y trial was in your courtroom on [May 21, 2003,] and I was found guilty of [the] charges[.] [T]he reason I [am] writing you this letter is because my attorney[,] John Taylor[,] did not represent [me] to the full[e]st of his ability[.] [T]he reason I say that is because he did not send out any [subpoenas] for all my [witnesses] and he also did not cross[-]examine the [witnesses] to prove [whether] their test[i]mony was cred[i]ble or not. [H]e would not ask any of the questions I wanted him to ask or show how the victim told the police and investigators two different stories in the motion of discovery. [He failed to elicit] the fact that I still lived in the house until the day I turned myself [in to] the Champaign County jail[.] [F]or that reason[,] I would like for you to grant me a new trial so I can have all of these things brought forth."

On May 29, 2003, defense counsel filed a posttrial motion raising other issues.

In a hearing on July 7, 2003, the trial court denied defense counsel's posttrial motion and, without responding to defendant's letter, proceeded to sentencing. After considering the presentence report and the arguments of counsel regarding an appropriate sentence, the court told defendant: "[Y]ou have the right to make a statement to the [c]ourt, state anything you wish to state, anything *** you think that the [c]ourt should know before you are sentenced." Defendant made a statement in allocution, in which he did not mention his letter to the court. The court asked defendant if he had anything else to say. Defendant said no. For home invasion, the trial court sentenced him to 22 years' imprisonment. On the other two convictions, the court imposed maximum extended terms of imprisonment: 10 years for aggravated battery and 6 years for domestic battery. The court allowed 196 days of presentence credit.

This appeal followed.

Defendant argues the one-act, one-crime rule in People v. King, 66 Ill. 2d 551, 566, 363 N.E.2d 838, 844-45 (1977), requires us to vacate the convictions of aggravated battery and domestic battery. We consider this issue de novo. People v. Dryden, 349 Ill. App. 3d 115, 124, 811 N.E.2d 302, 310 (2004).

The one-act, one-crime rule requires us to ask two questions. The first question is "whether [the] defendant's conduct consisted of separate acts or a single physical act." People v. Rodriguez, 169 Ill. 2d 183, 186, 661 N.E.2d 305, 306 (1996). One cannot carve multiple convictions out of "precisely the same physical act." Rodriguez, 169 Ill. 2d at 186, 661 N.E.2d at 306. If we find multiple acts, we ask a second question: "whether any of the offenses are lesser[-]included offenses." Rodriguez, 169 Ill. 2d at 186, 661 N.E.2d at 306. One cannot convict a defendant of both the greater offense and the lesser-included offense. Rodriguez, 169 Ill. 2d at 186, 661 N.E.2d at 306-07.

In People v. Tate, 106 Ill. App. 3d 774, 779, 436 N.E.2d 272, 276 (1982), we disagreed that the convictions of home invasion and aggravated battery in that case had been "'carved' from the same act." The knifing of the victim in Tate was the entire basis of the aggravated battery but only part of the basis of the home invasion, which included an additional act: the defendant's unauthorized entry into the dwelling place. We reasoned that "the entry by the assailant in[to] the *** home was a separate act which was an important and required part only of the home invasion offense." Tate, 106 Ill. App. 3d at 778, 436 N.E.2d at 275.

Arguably, Tate is distinguishable because, as we remarked in that case, the defendant cited no authority for the proposition that two convictions had been carved out of the same physical act if the act served as the complete basis of one conviction but only part of the basis of the other conviction. Tate, 106 Ill. App. 3d at 778-79, 436 N.E.2d at 276. In the present case, defendant cites two cases that appear to stand for precisely that proposition. In People v. Monigan, 204 Ill. App. 3d 686, 690, 561 N.E.2d 1358, 1360-61 (1990), and People v. Bell, 327 Ill. App. 3d 238, 243, 764 N.E.2d 551, 555 (2002), the Third District held that home invasion and aggravated battery were based on the same "act" and, therefore, King required the vacation of the conviction for aggravated battery. The Third District reasoned that "a conviction for aggravated battery could not stand where it was based upon the same act as that involved in the injury element of home invasion." (Emphasis added.) Monigan, 204 Ill. App. 3d at 690, 561 N.E.2d at 1360-61.

We have difficulty reconciling Monigan and Bell with People v. Lobdell, 121 Ill. App. 3d 248, 252, 459 N.E.2d 260, 263 (1983), in which the Third District reasoned as follows: "Since entry into the victim's home was only part of the home invasion offense and the sole act of the residential burglary offense, the two offenses were not carved from the same physical act." See also People v. Marston, 353 Ill. App. 3d 513, 519, 818 N.E.2d 1261, 1266 (2004), appeal denied, No. 99750 ("convictions of aggravated battery and home invasion do not violate one-act, one-crime principles[,] despite the infliction of only one injury[,] because [the] defendant's entry into the home was a separate act on which the home invasion charge was based"); People v. Damico, 309 Ill. App. 3d 203, 217, 722 N.E.2d 194, 206 (1999) (same).

We also have difficulty reconciling Monigan and Bell with the supreme court's decision in People v. McLaurin, 184 Ill. 2d 58, 703 N.E.2d 11 (1998), and our own decision in People v. Priest, 297 Ill. App. 3d 797, 698 N.E.2d 223 (1998)--decisions allowing a conviction for home invasion to coexist with a conviction for another offense even though the injury supporting the home invasion was the entire basis of the other conviction. In McLaurin, 184 Ill. 2d at 67-68, 703 N.E.2d at 16, the defendant entered the victim's house, tied him up, and killed him by dousing him with gasoline and setting him on fire. On appeal, the defendant argued that "the convictions for intentional murder and home invasion [violated the one-act, one-crime rule because they] resulted from the same physical act, that is, the setting of the fire." McLaurin, 184 Ill. 2d at 105, 703 N.E.2d at 33. The supreme court disagreed: "[T]he two offenses were not carved from the same physical act of setting the fire where the offense of home invasion involved an additional physical act of entering the dwelling of the victim." McLaurin, 184 Ill. 2d at 105, 703 N.E.2d at 33.

In Priest, 297 Ill. App. 3d at 802, 698 N.E.2d at 227, we held that convictions of home invasion and domestic battery were based upon interrelated acts rather than a single physical act. "The fact that [the] defendant unlawfully entered [the] home [was] an overt or outward manifestation supporting the home invasion conviction, a separate act from causing [the victim] bodily harm, [which] support[ed] the domestic[-]battery conviction." Priest, 297 Ill. App. 3d at 802, 698 N.E.2d at 227.

Thus, we respectfully disagree with Monigan and Bell. When comparing home invasion and aggravated battery in those cases, the Third District effectively reduced home invasion to the mere intentional infliction of an injury. An offense, however, can consist of more than one act. As charged in the present case, home invasion has two elements: the unauthorized entry of a dwelling and the intentional injury of a person therein. 720 ILCS 5/12-11(a)(2) (West 2002). One element is just as much as physical act as the other. See King, 66 Ill. 2d at 566, 363 N.E.2d at 844-45 (defining an "act" as "any overt or outward manifestation which will support a different offense"). "'As long as there are multiple acts as defined in King, their interrelationship does not preclude multiple convictions ***.'" (Emphasis omitted.) Rodriguez, 169 Ill. 2d at 189, 661 N.E.2d at 308, quoting People v. Myers, 85 Ill. 2d 281, 288, 426 N.E.2d 535, 538 (1981). The convictions in this case were based on interrelated acts rather than "precisely the same physical act." (Emphases added.) See Rodriguez, 169 Ill. 2d at 186, 661 N.E.2d at 306.

Having determined that the convictions were based on interrelated acts rather than the same act, we proceed to the second prong of Rodriguez: are any of the offenses lesser-included offenses? See Rodriguez, 169 Ill. 2d at 186, 661 N.E.2d at 306. Defendant cites two cases, one from the Second District (Damico, 309 Ill. App. 3d at 218, 722 N.E.2d at 206) and the other from the Third District (People v. Engle, 351 Ill. App. 3d 284, 290, 813 N.E.2d 761, 767-68 (2004)), holding that aggravated battery is an included offense of home invasion.

Generally, courts have taken two different approaches to identifying lesser-included offenses: the abstract-elements approach and the charging-instrument approach. People v. Bowens, 307 Ill. App. 3d 484, 492, 718 N.E.2d 602, 609 (1999). The former approach compares the statutory elements of the offenses, whereas the latter approach compares the facts alleged in the charging instrument. Bowens, 307 Ill. App. 3d at 492-93, 718 N.E.2d at 609. In Priest, 297 Ill. App. 3d at 804, 698 N.E.2d at 228, we used the abstract-elements approach to find that domestic battery was not an included offense of home invasion and that the two convictions therefore did not violate King. See Bowens, 307 Ill. App. 3d at 492, 718 N.E.2d at 609 (citing Priest among the group of cases adopting the abstract-elements approach). We acknowledged that under the charging-instrument approach (which we implicitly declined to use in that case), domestic battery would have been an included offense. Priest, 297 Ill. App. 3d at 803, 698 N.E.2d at 227. Later, in People v. Lee, 311 Ill. App. 3d 363, 370, 724 N.E.2d 557, 563 (2000), rev'd in part on other grounds, 213 Ill. 2d 218, 821 N.E.2d 307 (2004), and People v. Lindsey, 324 Ill. App. 3d 193, 200, 753 N.E.2d 1270, 1277 (2001), we used the charging-instrument approach to decide whether one offense was an included offense of another for purposes of King. In neither of those cases did we mention Priest.

More than once, the supreme court has "reaffirmed its preference for the charging-instrument approach to identifying lesser[-]included offenses." McLaurin, 184 Ill. 2d at 104, 703 N.E.2d at 33, citing People v. Novak, 163 Ill. 2d 93, 643 N.E.2d 762 (1994). In Rodriguez, the supreme court referred to the indictment, not to the abstract statutory elements, when deciding whether home invasion was a lesser-included offense of aggravated criminal sexual assault. Rodriguez, 169 Ill. 2d at 190, 661 N.E.2d at 308 ("The indictment refers to different conduct for each offense"). We will follow the supreme court's lead by using the charging-instrument approach to identify lesser-included offenses for purposes of the one-act, one-crime rule.

To determine whether one offense is an included offense of another, we look at the facts alleged in the charging instrument. McLaurin, 184 Ill. 2d at 104, 703 N.E.2d at 33; Lindsey, 324 Ill. App. 3d at 200, 753 N.E.2d at 1277. (Thus, our inquiry under the second prong ofRodriguez is broader than our inquiry under the first prong. Under the first prong, we were concerned with only one type of fact: physical acts. See People v. Harvey, 211 Ill. 2d 368, 389-90, 813 N.E.2d 181, 195 (2004).) Again, whether an offense is a lesser-included offense of another depends on the charging instrument, not on the abstract statutory definitions of the offenses. See People v. Jones, 207 Ill. 2d 122, 143, 797 N.E.2d 640, 652 (2003) (Fitzgerald, J., specially concurring). From one case to another, charging instruments will vary in the facts that they allege, even if they allege the same crime. Therefore, just because courts have concluded in other cases that domestic battery or aggravated battery was a lesser- included offense of home invasion, it does not follow that we should so conclude from the charging instrument in the present case. See Jones, 207 Ill. 2d at 143, 797 N.E.2d at 652 ("depending upon the language in the charging instrument, theft may be a lesser-included offense of residential burglary" (emphasis added)). If the greater offense, as set forth in the charging instrument, also describes a lesser offense, the lesser offense is an included offense. 720 ILCS 5/2-9(a) (West 2002); McLaurin, 184 Ill. 2d at 104, 703 N.E.2d at 33; Lindsey, 324 Ill. App. 3d at 200, 753 N.E.2d at 1277. If the lesser offense has an element, however, that the greater offense lacks, the greater offense does not describe the lesser offense, and the lesser offense, therefore, is not an included offense. See McLaurin, 184 Ill. 2d at 105, 703 N.E.2d at 33;Lindsey, 324 Ill. App. 3d at 201, 753 N.E.2d at 1277.

The State alleged the following facts in the count of home invasion (which, being a Class X felony (720 ILCS 5/12-11(c) (West 2002)), was the greater offense in this case):

"[D]efendant[,] not a peace officer acting in the line of duty, knowingly and without authority entered the dwelling place of another ***, knowing that one or more persons were present[,] and intentionally caused injuries to Kelly Slade[,] a person therein[,] by beating her ***."

The State alleged the following facts in the count of aggravated battery, a Class 3 felony (720 ILCS 5/12-4(e) (West 2002)):

"[D]efendant, in committing a battery ***, without legal justification and by use of a deadly weapon, an aluminum bat, knowingly caused bodily harm to Kelly Slade, in that the said defendant beat her with the bat ***."

The State alleged the following facts in the count of domestic battery, a Class 4 felony (720 ILCS 5/12-3.2(b) (West 2002)):

"[D]efendant, knowingly and without legal justification, caused bodily harm to Kelly Slade, a family or household member of the defendant, in that the said defendant beat her with his hands, and the said defendant[,] ha[d] been previously convicted of [d]omestic [b]attery ***."

According to the charging instrument, aggravated battery has a factual element that home invasion lacks: use of a deadly weapon. To prove home invasion, the State had to prove that defendant intentionally injured Slade by beating her--but not that he beat her with a weapon, let alone a deadly weapon. According to the charging instrument, domestic battery has two factual elements that home invasion lacks: Slade's identity as a family or household member and defendant's previous conviction of domestic battery. Ergo, neither aggravated battery nor domestic battery is a lesser-included offense of home invasion. See McLaurin, 184 Ill. 2d at 105, 703 N.E.2d at 33; Lindsey, 324 Ill. App. 3d at 201, 753 N.E.2d at 1277.

3. Was It Necessary To Distinguish Between the Blows?

On the authority of People v. Crespo, 203 Ill. 2d 335, 788 N.E.2d 1117 (2001), defendant argues that because the charging instrument and the prosecutor's arguments at trial failed to distinguish between the generalized beating in the home-invasion count and the beatings in the aggravated-battery and domestic-battery counts, we must vacate the convictions on the latter two counts.

In Crespo, 203 Ill. 2d at 338, 788 N.E.2d at 1119, the evidence at trial revealed that the defendant had stabbed the victim three times. The State charged him with one count of armed violence and two counts of aggravated battery (one count based on battery with a deadly weapon and the other based on great bodily harm). Crespo, 203 Ill. 2d at 342-43, 788 N.E.2d at 1121. The count of armed violence was predicated on the count of aggravated battery with a deadly weapon. Crespo, 203 Ill. 2d at 339, 788 N.E.2d at 1119. Rather than apportion the offenses among the three stab wounds, the indictment treated the wounds as one infliction of bodily harm, "charg[ing] [the] defendant with the same conduct under different theories of criminal culpability." Crespo, 203 Ill. 2d at 342, 788 N.E.2d at 1121. On appeal, the State tried to obviate the one-act, one-crime rule by arguing that each of the three stab wounds could support an independent conviction. Crespo, 203 Ill. 2d at 340, 788 N.E.2d at 1120. In trial court, however, the State had "treat[ed] the conduct of the defendant as a single act." Crespo, 203 Ill. 2d at 344, 788 N.E.2d at 1122. The supreme court stated: "We believe that to apportion the crimes among the various stab wounds for the first time on appeal would be profoundly unfair." Crespo, 203 Ill. 2d at 343, 788 N.E.2d at 1122.

Again, in Crespo, 203 Ill. 2d at 342, 788 N.E.2d at 1121, the "counts charg[ed] [the] defendant with the same conduct under different theories of criminal culpability." That was the crucial finding on which the supreme court's analysis in Crespo turned. In the present case, as we have explained, the charge of home invasion was based on different conduct than the counts of aggravated battery and domestic battery. The conduct was different in that home invasion included an unauthorized entry, a physical act that the other two offenses lacked. For purposes of the one-act, one-crime rule, the State has no occasion to differentiate between the blows defendant inflicted upon Slade, because even if the count of home invasion refers to the same blows as the counts of aggravated battery and domestic battery, King allows all three convictions to stand.

Defendant argues that because aggravated battery and domestic battery were less serious offenses than home invasion, the trial court lacked statutory authority to impose extended-term sentences on the convictions of aggravated battery and domestic battery. See 730 ILCS 5/5-8-2(a) (West 2002);People v. Jordan, 103 Ill. 2d 192, 206, 469 N.E.2d 569, 575 (1984). The State argues that defendant has forfeited this issue by omitting it from his posttrial motion. See 730 ILCS 5/5-8-1(c) (West 2002); People v. Reed, 177 Ill. 2d 389, 395, 686 N.E.2d 584, 586 (1997).

As defendant points out, the supreme court held in People v. Thompson, 209 Ill. 2d 19, 27, 805 N.E.2d 1200, 1204-05 (2004), that an extended-term sentence unauthorized by statute was void and a defendant could attack such a sentence for the first time on appeal. The State argues: "Defendant's reliance on Thompson is misplaced because in Thompson the State conceded that the extended-term sentence involved was void ***." On the contrary, that was not the concession the State made in Thompson. The State conceded that the extended-term sentence was "improper," i.e., unauthorized by law (Thompson, 209 Ill. 2d at 23, 805 N.E.2d at 1202), but the State argued that this impropriety made the sentence "merely voidable," not void, and that by failing to raise the issue in a motion to withdraw the guilty plea or in his postconviction petition, the defendant had "waived" or forfeited his right to challenge the extended-term sentence (Thompson, 209 Ill. 2d at 22, 805 N.E.2d at 1202). The supreme court disagreed. After a lengthy analysis, the supreme court concluded that the extended-term sentence was "void" and the defendant could attack such a void order "at any time or in any court, either directly or collaterally. An argument that an order or judgment is void is not subject to waiver." Thompson, 209 Ill. 2d at 27, 805 N.E.2d at 1204-05. The State's claim of forfeiture in this case is simply untenable.

2. Did Statutory Law Authorize These Extended-Term Sentences?

If a trier of fact convicts the defendant of multiple offenses of differing classes, section 5-8-2(a) of the Unified Code of Corrections (Unified Code) (730 ILCS 5/5-8-2(a) (West 2002)) authorizes the trial court to impose an extended-term sentence only on the offense within the most serious class. Jordan, 103 Ill. 2d at 206, 469 N.E.2d at 575. The supreme court has construed section 5-8-2(a) to allow a single exception to that rule: a court may impose extended-term sentences "on separately charged, differing class offenses that arise from unrelated courses of conduct" (emphasis added) (People v. Coleman, 166 Ill. 2d 247, 257, 652 N.E.2d 322, 327 (1995)), that is, courses of conduct in which "there was a substantial change in the nature of the defendant's criminal objective" (People v. Bell, 196 Ill. 2d 343, 354, 751 N.E.2d 1143, 1149 (2001)).

In the present case, the jury found defendant guilty of home invasion, a Class X felony (720 ILCS 5/12-11(c) (West 2002)); aggravated battery, a Class 3 felony (720 ILCS 5/12-4(e) (West 2002)); and domestic battery with a previous domestic-battery conviction, a Class 4 felony (720 ILCS 5/12-3.2(b) (West 2002)). Home invasion was the most serious offense. Therefore, unless these three offenses arose from unrelated courses of conduct in which there was a substantial change in the nature of defendant's criminal objective, statutory law authorized the trial court to impose an extended-term sentence only on the conviction of home invasion.

Calling these three offenses unrelated would be unrealistic. Defendant might have had immediate subsidiary objectives, such as preventing Slade from calling the police, but his overall objective--his ultimate purpose behind all three offenses--was to dissuade her from breaking up with him. He kept saying the "same stuff" over and over again: that he "wanted to be with [her]" and "work it out" and she "couldn't leave him." The record contains no evidence of a substantial change in the nature of his criminal objective.

It follows that the extended-term portion of the sentences on the convictions of aggravated battery and domestic battery are void. We vacate the extended-term portion of those sentences, thereby reducing the sentences to the maximum nonextended terms of imprisonment authorized by the Unified Code: five years for aggravated battery (730 ILCS 5/5-8-1(a)(6) (West 2002)) and three years for domestic battery with a previous domestic-battery conviction (730 ILCS 5/5-8-1(a)(7) (West 2002)). See Thompson, 209 Ill. 2d at 29, 805 N.E.2d at 1206.

C. Constitutional Challenge to the Domestic-Battery Statute

The victim of domestic battery is a "family or household member as defined in subsection (3) of [s]ection 112A-3 of the Code of Criminal Procedure of 1963, as amended [(725 ILCS 5/112A-3(3) (West 2002))]." 720 ILCS 5/12-3.2(a)(2) (West 2002). Section 112A-3(3) defines "family or household members" to include "persons who *** have had a dating or engagement relationship." (Emphasis added.) 725 ILCS 5/112A-3(3) (West 2002).

Defendant argues that because section 112A-3(3) places no temporal limit on the verb "have had," the domestic-battery statute is unconstitutionally vague. According to defendant, it would be impossible for a reasonable person to ascertain the cutoff date after which the former dating or engagement relationship no longer counts. That is to say, how much time must pass, after the termination of the relationship, before the battery of an ex-girlfriend or ex-boyfriend will be considered merely simple battery instead of domestic battery--5 months, 5 years, 50 years? The supreme court recently answered that question in an opinion issued after the parties filed their briefs in this case: "[T]he statute has no time limit. But that does not make the statute vague." People v. Wilson, 214 Ill. 2d 394, 400-01, 827 N.E.2d 416, 420 (2005). It is impossible to identify the time limit not because the statute is vague but because the time limit simply does not exist. By the very act of complaining about the lack of any temporal boundary to the definition of a "family or household member," one implicitly admits that the definition is, in that respect, sufficiently clear--one might say all too clear.

Thus, even to a hypothetical defendant battering an ex-fianc