|  | @@ -1444,6 +1444,7 @@ public class ClassGroupServiceImpl extends BaseServiceImpl<Integer, ClassGroup>
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				|  |  |          List<Integer> studentIdList = classGroup4MixDto.getStudents();
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				|  |  |          List<StudentRegistration> studentList = studentRegistrationService.findStudentListByUserIdList(musicGroupId, studentIdList);
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				|  |  |  
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				|  |  | +
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				|  |  |          List<Integer> subjectIdList = studentList.stream().map(student -> student.getActualSubjectId()).collect(Collectors.toList());
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				|  |  |          TeachModeEnum teachMode = TeachModeEnum.OFFLINE;
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				|  |  |          if (classGroup4MixDto.getType().equals(ClassGroupTypeEnum.HIGH_ONLINE)) {
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