nero[4], orne[4], oreo[4], noro[4], eros[4], roso[4],
eon[3], one[3], ono[3], ner[3], ren[3], ero[3], nor[3], oro[3], sen[3], nos[3], son[3], oso[3], ser[3], ros[3],
en[2], eo[2], no[2], on[2], er[2], re[2], or[2], ro[2], es[2], se[2], os[2],
