bund[9], dubn[9], bodu[9], budo[9], bonu[8], buno[8], bond[7], nudo[7],
bud[8], bun[7], obu[7], bod[6], dnu[6], nud[6], duo[6], udo[6], bon[5], dno[4], don[4],
bu[6], ud[5], bo[4], nu[4], do[3], od[3], no[2], on[2],
