0 -> CCCCG (CCCG) 1 -> CCCGC
1 -> CCCGC (CGC) 2 -> CGCGC

$result = [
            [ 0, 'C----' ],
            [ 1,  '----C' ],
            [ 1, 'CC---' ],
            [   2, '---GC' ]
          ];