che[6], ech[6], hec[6], hem[6], hep[6], ben[5], hen[5], cep[5], cen[4], cne[4], men[4], nem[4], nep[4], pen[4],
hm[5], be[4], eh[4], he[4], ce[3], em[3], me[3], pe[3], en[2],
