bisu[8], webu[8], bies[6], wisu[6], siew[4], siwe[4], wsie[4], wiew[4],
bus[7], bis[5], esu[5], siu[5], web[5], suw[5], eis[3], sie[3], wie[3], swe[3], siw[3], wis[3], wsi[3],
bu[6], be[4], bi[4], su[4], wu[4], es[2], se[2], si[2], ew[2], we[2], iw[2],
