ceru[7], urea[6], rura[6], arce[5], cera[5], race[5], erce[5],
ecu[6], cru[6], aur[5], rur[5], car[4], rac[4], cer[4], era[3], rea[3],
au[4], ce[3], ee[2], ar[2], er[2], re[2],
