biur[8], bisu[8], brus[8], burs[8], psui[7], siup[7], birr[6], rusi[6], pirs[5],
pub[8], bru[7], bur[7], bus[7], piu[6], psu[6], spu[6], brr[5], bis[5], rui[5], rur[5], siu[5], rus[5], sur[5], prr[4], psi[4], sir[3],
bu[6], bi[4], su[4], pi[3], si[2],
