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  21-25:ABBCA  26-30:ADDBB  31-35:ACCBB  36-40:DADBA
  41-45:BBCBC  46-50:BBCCA  51-55:AAABD  56-60:AAABC
  61-65:BABBA  66-70:ADCAA
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  76:ACE   77:CE   78:ABCDE 79:ACDE  80:ABCE
  81:BDE   82:CDE  83:ABC  84:BC   85:CD