open[5], peon[5], poen[5], nerp[5], oper[5], pero[5], nero[4], orne[4],
nep[4], pen[4], per[4], rep[4], por[4], pro[4], rop[4], eon[3], one[3], ner[3], ren[3], ero[3], nor[3],
pe[3], op[3], po[3], en[2], eo[2], no[2], on[2], er[2], re[2], or[2], ro[2],
