penne[8], neper[8], renen[5], renne[5],
epen[7], penn[7], peer[7], reep[7], eren[4], neer[4], rene[4], renn[4],
per[6], rep[6], nee[3], ree[3], ern[3], ren[3],
ne[2], er[2], re[2],
