fach[11], gach[9], ghee[8], echa[7], heca[7], eche[7], hece[7],
agf[9], fag[9], gaf[9], haf[9], caf[8], efa[7], fee[7], ach[6], cha[6], che[6], ech[6], hec[6], ehe[5],
fa[6], ef[6], fe[6], ag[4], ha[4], eh[4], he[4], ce[3], ee[2],
