a-a a-b aaa aab aam aao aas aay ab- aba abb abm abo abs aby ama amb amm amo ams amy aoa aob aom aoo aos as- asa asb asm aso ass asy ay- aya ayo ays baa bab bam bao bas bay bba bbb bbm bbo bbs bby bma bmb bmm bmo bms boa bob bom boo bos boy bsa bsb bsm bso bss bsy by- bya bym byo bys m-o maa mab mam mao mas may mba mbb mbm mbo mbs mma mmb mmm mmo mms moa mob mom moo mos moy msa msb msm mso mss msy my- mya myb mym myo mys oaa oab oam oao oas ob- oba obb obm obo obs oby om- oma omb omm omo oms omy oo- ooa oob oom ooo oos os- osa osb osm oso oss oya oyo oys saa sab sam sao sas say sba sbb sbm sbo sbs sby sma smb smm smo sms smy soa sob som soo sos soy ss- ssa ssb ssm sso sss sy- sya syb sym sys yaa yab yam yao yas yay ybm ybs yby yma ymm ymo yms yob yom yoo yos yoy ysa ysb ysm yso yss ysy yyb yys yyy