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				@@ -371,6 +371,9 @@ public class StudentServeServiceImpl implements StudentServeService { 
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				             if(typeCourseMap.containsKey(CourseSchedule.CourseScheduleType.SINGLE)){ 
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				                 Set<String> musicGroupIds = noCourseStudentMusicIdsMap.get(studentCourseMapEntry.getKey()); 
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				+                if(CollectionUtils.isEmpty(musicGroupIds)){ 
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				+                    continue; 
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				+                } 
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				                 Map<Integer, Integer> teacherNumMap = new HashMap<>(); 
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				                 for (String groupId : musicGroupIds) { 
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				                     Integer teacherId = null; 
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				@@ -433,6 +436,9 @@ public class StudentServeServiceImpl implements StudentServeService { 
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				                 } 
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				             }else if(typeCourseMap.containsKey(CourseSchedule.CourseScheduleType.MIX)){ 
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				                 Set<String> musicGroupIds = noCourseStudentMusicIdsMap.get(studentCourseMapEntry.getKey()); 
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				+                if(CollectionUtils.isEmpty(musicGroupIds)){ 
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				+                    continue; 
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				+                } 
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				                 Map<Integer, Integer> teacherNumMap = new HashMap<>(); 
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				                 for (String groupId : musicGroupIds) { 
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				                     Integer teacherId = null; 
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				@@ -498,6 +504,9 @@ public class StudentServeServiceImpl implements StudentServeService { 
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				         for (Integer noCourseServeStudentId : noCourseServeStudentIds) { 
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				             Set<String> musicGroupIds = noCourseStudentMusicIdsMap.get(noCourseServeStudentId); 
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				+            if(CollectionUtils.isEmpty(musicGroupIds)){ 
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				+                continue; 
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				+            } 
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				             Map<Integer, Integer> teacherNumMap = new HashMap<>(); 
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				             for (String groupId : musicGroupIds) { 
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				                 Integer teacherId = null; 
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