bug[9], gub[9], buc[8], cug[8], bum[8], umb[8], gum[8], pub[8], cum[7], muc[7], bun[7], gnu[7], cup[7], puc[7], pum[7], mun[6], pun[6], wun[5],
bu[6], gu[6], mu[5], nu[4], wu[4],