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Key Unit 1
1-5 :DBCBB 6-10 : AACDD 11-15:B D CB C 16-20:ADBBB Unit 2
1-10 BCCDA BCDDC 11-20 BDBCA BCDAB 21-25 ACBCB Unit 3
1¡ª5: BAAAB 6¡ª10: DAADA 11¡ª15: BDABB 16¡ª20: CBACB Unit 4
1-5 ACDAA 6-10 ABCAD 11-15 BBABA 16-20 BACBC Unit 5
1-5 ACABB 6-10 ADBAD 11-15 BCACB 16-20 DACCD Unit 6
1--5 CBCDC 6--10 CBDCC 11--15 DAABD 16--20 BCBAC Unit 7
1¡ª5: DADBC 6¡ª10: BDACA 11¡ª15: DABCB 16¡ª20: ADBCA Unit 8
1-5 BCCAB 6-10 ACAAB 11-15 DBCDB 16-20 DDABC
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