pneu[7], pure[7], bure[6], reun[4], rune[4], uren[4], urne[4],
pub[8], per[6], rep[6], pur[6], erb[5], ern[3], ren[3], neu[3], reu[3], ure[3], nur[3], run[3],
ne[2], er[2], re[2], nu[2], ur[2],
