ibis[6], tipi[6], trip[6], tips[6], pirs[5], spis[5],
bit[6], bis[5], pit[5], pst[5], psi[4], pss[4], itr[4], tir[4], tri[4], sit[4], tss[4], sir[3],
bi[4], pi[3], ts[3], ii[2], si[2],
