refu[10], furo[10], rufo[10], foce[9], efor[8], ceru[7], euro[6], cero[5], orce[5],
ufo[9], fru[9], fur[9], ruf[9], efo[7], ref[7], for[7], orf[7], ecu[6], cru[6], oru[5], cer[4], ero[3],
fu[8], uf[8], ef[6], fe[6], ce[3], co[3], eo[2], er[2], re[2], or[2], ro[2],
