opie[5], peri[5], oper[5], pero[5], oere[4],
pie[4], poi[4], per[4], rep[4], por[4], pro[4], rop[4], rei[3], ero[3], roi[3],
pe[3], pi[3], op[3], po[3], ee[2], eo[2], er[2], re[2], or[2], ro[2],
