siwy[5], wisy[5], siei[4], iwie[4], wiei[4], siew[4], siwe[4], wsie[4], siwi[4], wisi[4],
esy[4], ewy[4], iwy[4], eis[3], sie[3], wie[3], wii[3], swe[3], siw[3], wis[3], wsi[3],
wy[3], ii[2], es[2], se[2], si[2], ew[2], we[2], iw[2],
