bono[6], obon[6], open[5], peon[5], poen[5], opon[5], pono[5],
ben[5], bon[5], pop[5], nep[4], pen[4], eon[3], one[3], ono[3],
be[4], bo[4], pe[3], op[3], po[3], en[2], eo[2], no[2], on[2],
