bug[9], gub[9], buc[8], cug[8], bum[8], umb[8], gum[8], cum[7], muc[7], bun[7], gnu[7], buz[7], bzu[7], guz[7], mun[6], ucz[6], muz[6],
bu[6], gu[6], mu[5], nu[4],