siei[4], iwie[4], wiei[4], siew[4], siwe[4], wsie[4], siwi[4], wisi[4], wiew[4],
eis[3], sie[3], wie[3], wii[3], swe[3], siw[3], wis[3], wsi[3],
ii[2], es[2], se[2], si[2], ew[2], we[2], iw[2],
