acre[7], aren[4], eren[4], neer[4], rene[4], rare[4], narr[4],
car[6], cer[6], nee[3], are[3], ree[3], ran[3], ern[3], ren[3], rar[3],
an[2], na[2], ne[2], ar[2], er[2], re[2],
