a-a a-b aaa aab aam aar aay ab- aba abb abm abr aby ama amb amm amr amy ar- ara arb arm arr ary ay- aya ayr baa bab bam bar bay bba bbb bbm bbr bby bma bmb bmm bmr bra brb brm brr bry by- bya bym byr m-r maa mab mam mar may mba mbb mbm mbr mma mmb mmm mmr mra mrb mrm mrr mry my- mya myb mym myr ra- raa rab ram rar ray rba rbb rbm rbr rma rmb rmm rmr rra rrb rrm rrr ry- rya rym ryr ryy yaa yab yam yar yay ybm ybr yby yma ymm yra yyb yyy