1-10 BCBDCABBBB
11BDE 12 ABCDE 13 ABDE 14 ABCE 15 ACE
16 BCDE 17 ACE 18 BCE 19 ABCE 20 ADE
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1-10 BCBDCABBBB
11BDE 12 ABCDE 13 ABDE 14 ABCE 15 ACE
16 BCDE 17 ACE 18 BCE 19 ABCE 20 ADE