| D | ↗ | C | StudentUpdate improved |
| A | ↛ | cleanClone removed |
| ⇢ | A | processParallel() added | |
| ⇢ | A | StudentsIdGen::processParallel() added | |
| ⇢ | A | Institution_subject::getStudentsCount() added | |
| ⇢ | A | CleanExamData::cleanInvalidData() added | |
| ⇢ | A | CleanExamData::cleanData() added | |
| ⇢ | A | CleanExamData::process() added | |
| ⇢ | A | UpdateStudentsCount::process() added | |
| ⇢ | A | UpdateStudentsCount::updateSubjectCount() added | |
| ⇢ | A | StudentsIdGen::process() added | |
| ⇢ | A | sig_handler() added | |
| A | ↛ | cleanClone::handle() removed | |
| A | ↛ | StudentUpdate::insertSubject() removed | |
| A | ↛ | cleanClone::__construct() removed | |
| A | ↛ | cleanClone::process() removed |