core[8], orfe[8], cour[8], efeu[7], cure[7], freu[7], rufe[7], ufer[7], ufre[7], euro[5], roue[5], euer[4], eure[4], reue[4],
ufo[7], fee[6], cer[6], ruf[6], ree[3], reu[3], ure[3],
er[2], re[2], ur[2],
