a-a a-b a-c aaa aab aac aam aan aao aas aay ab- aba abb abc abm abn abo abs aby ac- aca acb acc acm acn aco acs acy ama amb amc amm amn amo ams amy an- ana anb anc anm ann ano ans any aoa aob aoc aom aon aoo aos as- asa asb asc asm asn aso ass asy ay- aya ayc ayn ayo ays baa bab bac bam ban bao bas bay bba bbb bbc bbm bbn bbo bbs bby bca bcb bcc bcm bcn bco bcs bcy bma bmb bmc bmm bmn bmo bms bna bnb bnc bnn bno bns boa bob boc bom bon boo bos boy bsa bsb bsc bsm bsn bso bss bsy by- bya byc bym byn byo bys c-- caa cab cac cam can cao cas cay cba cbb cbc cbm cbn cbo cbs cby cca ccb ccc ccm ccn cco ccs cma cmb cmc cmm cmn cmo cms cmy cn- cna cnb cnc cnm cnn cno cns cny co- coa cob coc com con coo cos coy csa csb csc csm csn cso css csy cya cyb cyc cym cyn cyo cys m-o maa mab mac mam man mao mas may mba mbb mbc mbm mbo mbs mc- mca mcb mcc mcm mcn mco mcs mma mmb mmc mmm mmn mmo mms mna mnb mnc mnm mnn mno mns moa mob moc mom mon moo mos moy msa msb msc msm msn mso mss msy my- mya myb myc mym myn myo mys naa nab nac nam nan nao nas nay nba nbb nbc nbm nbn nbo nbs nca ncb ncc ncm ncn nco ncs nma nmb nmc nmm nmn nmo nms nna nnb nnc nnm nnn nno nns no- noa nob noc nom non noo nos noy nsa nsb nsc nsm nsn nso nss nsy nya nyc nym nyn nyo nys nyy oaa oab oac oam oan oao oas ob- oba obb obc obm obn obo obs oby oc- oca ocb occ ocm ocn oco ocs om- oma omb omc omm omn omo oms omy on- ona onb onc onn ono ons ony oo- ooa oob ooc oom oon ooo oos os- osa osb osc osm osn oso oss oya oyo oys saa sab sac sam san sao sas say sba sbb sbc sbm sbn sbo sbs sby sca scb scc scm scn sco scs sma smb smc smm smn smo sms smy sna snb snc snm snn sno sns sny soa sob soc som son soo sos soy ss- ssa ssb ssc ssm ssn sso sss sy- sya syb syc sym syn sys yaa yab yac yam yan yao yas yay ybc ybm ybs yby yca ycc yco ycs ycy yma ymc ymm ymo yms yna ynn yns yny yob yoc yom yon yoo yos yoy ysa ysb ysc ysm yso yss ysy yyb yyc yys yyy