ibis[6], brwi[6], pirs[5], wpis[5], siwi[4], wisi[4],
bis[5], psi[4], piw[4], sir[3], wii[3], wir[3], siw[3], wis[3], wsi[3],
bi[4], pi[3], ii[2], si[2], iw[2],
