arece[6], racie[6], recie[6],
acie[5], ecie[5], arce[5], cera[5], race[5], erce[5], arie[4],
cie[4], car[4], rac[4], cer[4], era[3], rea[3], air[3], rai[3], rei[3],
ce[3], ci[3], ee[2], ar[2], er[2], re[2],
