osie[4], siew[4], siwe[4], wsie[4], siwo[4], sowi[4], swoi[4], wsio[4],
eis[3], sie[3], osi[3], sio[3], soi[3], wie[3], ewo[3], owe[3], iwo[3], owi[3], wio[3], swe[3], siw[3], wis[3], wsi[3],
eo[2], es[2], se[2], si[2], os[2], ew[2], we[2], iw[2],
