a-a a-b a-t aaa aab aam aao aas aat aay ab- aba abb abm abo abs abt aby ama amb amm amo ams amt amy aoa aob aom aoo aos aot as- asa asb asm aso ass ast asy at- ata atb atm ato ats att ay- aya ayo ays ayt baa bab bam bao bas bat bay bba bbb bbm bbo bbs bbt bby bma bmb bmm bmo bms bmt boa bob bom boo bos bot boy bsa bsb bsm bso bss bst bsy bta btb btm bto bts btt bty by- bya bym byo bys byt m-o maa mab mam mao mas mat may mba mbb mbm mbo mbs mbt mma mmb mmm mmo mms mmt moa mob mom moo mos mot moy msa msb msm mso mss mst msy mta mtb mtm mto mts mtt my- mya myb mym myo mys myt oaa oab oam oao oas oat ob- oba obb obm obo obs obt oby om- oma omb omm omo oms omt omy oo- ooa oob oom ooo oos oot os- osa osb osm oso oss ost ot- ota otb otm oto ots ott oya oyo oys saa sab sam sao sas sat say sba sbb sbm sbo sbs sbt sby sma smb smm smo sms smt smy soa sob som soo sos sot soy ss- ssa ssb ssm sso sss sst sta stb stm sto sts stt sty sy- sya syb sym sys syt taa tab tam tao tas tat tay tba tbb tbm tbo tbs tbt tma tmb tmm tmo tms tmt tmy to- toa tob tom too tos tot toy tsa tsb tsm tso tss tst tsy tta ttb ttm tto tts ttt tty tya tym tyo tys tyt yaa yab yam yao yas yat yay ybm ybs yby yma ymm ymo yms ymt yob yom yoo yos yot yoy ysa ysb ysm yso yss yst ysy yta ytm yto yts ytt yyb yys yyt yyy