biby[9], bisy[7], weby[7], bies[6], siwy[5], wisy[5], siew[4], siwe[4], wsie[4],
bib[7], bis[5], web[5], esy[4], ewy[4], iwy[4], eis[3], sie[3], wie[3], swe[3], siw[3], wis[3], wsi[3],
by[5], be[4], bi[4], wy[3], es[2], se[2], si[2], ew[2], we[2], iw[2],
