a-a a-b aaa aab aam aao aar aay ab- aba abb abm abo abr aby ama amb amm amo amr amy aoa aob aom aoo aor ar- ara arb arm aro arr ary ay- aya ayo ayr baa bab bam bao bar bay bba bbb bbm bbo bbr bby bma bmb bmm bmo bmr boa bob bom boo bor boy bra brb brm bro brr bry by- bya bym byo byr m-o m-r maa mab mam mao mar may mba mbb mbm mbo mbr mma mmb mmm mmo mmr moa mob mom moo mor moy mra mrb mrm mro mrr mry my- mya myb mym myo myr oaa oab oam oao oar ob- oba obb obm obo obr oby om- oma omb omm omo omr omy oo- ooa oob oom ooo oor or- ora orb orm oro orr ory oya oyo ra- raa rab ram rao rar ray rba rbb rbm rbo rbr rma rmb rmm rmo rmr roa rob rom roo ror roy rra rrb rrm rrr ry- rya rym ryo ryr ryy yaa yab yam yao yar yay ybm ybr yby yma ymm ymo yob yom yoo yor yoy yra yro yyb yyy