fen[7], nef[7], efo[7], fon[7], che[6], ech[6], hec[6], hoc[6], och[6], hen[5], cen[4], cne[4], noc[4], eon[3], one[3],
ef[6], fe[6], eh[4], he[4], ho[4], oh[4], ce[3], co[3], en[2], eo[2], no[2], on[2],
