bbbb bnrr brrr brun brut bry- bryn btrt btry bttb bubb bubu bunb bunn bunt bunu bur- burb burn burr burt buru bury but- butt buty buyu byrn byrt byun nbty nnnn nntn ntnu ntru nttr nuby nunn nunt nuny nurn nurr nurt nuru nutt nutu nynt nyny nyrb nytb rbbb rbbr rnbr rnnt rnut rrrr rrun rubb rubu ruby runn runt runy ruru rutt rutu ruty ruun rynn rynt rytt ryun ryyt tbrb tnut trtr trub trun trut truu try- tryb ttbb tttt tubb tubr tubu tunb tunn tunu tuny turb turn turr turt turu tury tutt tutu tuty tuyn tynt tyny tyr- tyrr tytt tyty tyyn untb unty unut urry urun urur urut uryn utby uttu uuuu uuyn ybry yrun yryn yubu yuny yurn yurt yury yutu yuty yuyu yyyy