beru[8], bure[8], erbu[8], webu[8], brew[6], eruw[6],
buu[9], bru[7], bur[7], ber[5], erb[5], reb[5], web[5], rew[3], wre[3],
bu[6], uu[6], be[4], wu[4], er[2], re[2], ew[2], we[2],
