bach[9], hebd[9], dach[8], dech[8], bace[7], echa[7], heca[7],
bab[7], cab[6], bad[6], dba[6], ach[6], cha[6], che[6], ech[6], hec[6],
ba[4], be[4], ha[4], eh[4], he[4], ad[3], da[3], ce[3], de[3],
