feen[7], farn[7], fern[7], aren[4], eren[4], neer[4], rene[4],
fee[6], fan[6], nee[3], are[3], ree[3], ran[3], ern[3], ren[3],
fa[5], an[2], na[2], ne[2], ar[2], er[2], re[2],
