Length: 5; total count: 13; counts(bdpq, bd, bp, bq, b) = (3, 1, 5,  1, 3)
b=d=p=q: CTTTC, CTCTC, cctcc
    b=d: ccttc
    b=p: CRCRC, CTRRC, CTTRC, CRRRC, ccrcc
    b=q: CRCLC
      b: CTCRC, cctrc, ccrrc