bitw[7], birr[6], brwi[6], zbir[6], sitw[5], wist[5], witz[5], zwis[4],
bit[6], brr[5], bis[5], biz[5], izb[5], itr[4], tir[4], tri[4], sit[4], sir[3], wir[3], wrr[3], siw[3], wis[3], wsi[3], zis[3], wiz[3],
bi[4], ts[3], si[2], iw[2],
