a-a a-b aaa aab aad aam aan aao aas ab- aba abb abd abm abn abo abs ad- ada adb add adm adn ado ads ama amb amd amm amn amo ams an- ana anb and anm ann ano ans aoa aob aod aom aon aoo aos as- asa asb asd asm asn aso ass baa bab bad bam ban bao bas bba bbb bbd bbm bbn bbo bbs bda bdb bdd bdm bdo bds bma bmb bmd bmm bmn bmo bms bna bnb bnd bnn bno bns boa bob bod bom bon boo bos bsa bsb bsd bsm bsn bso bss daa dab dad dam dan dao das dba dbb dbd dbm dbn dbo dbs dda ddb ddd ddm ddn ddo dds dma dmb dmd dmm dmn dmo dms dna dnb dnd dnm dnn dno dns doa dob dod dom don doo dos dsa dsb dsd dsm dsn dso dss m-o maa mab mad mam man mao mas mba mbb mbd mbm mbo mbs mda mdb mdd mdm mdn mdo mds mma mmb mmd mmm mmn mmo mms mna mnb mnm mnn mno mns moa mob mod mom mon moo mos msa msb msd msm msn mso mss naa nab nad nam nan nao nas nba nbb nbd nbm nbn nbo nbs nda ndb ndd ndm ndn ndo nds nma nmb nmd nmm nmn nmo nms nna nnb nnm nnn nno nns no- noa nob nod nom non noo nos nsa nsb nsd nsm nsn nso nss oaa oab oad oam oan oao oas ob- oba obb obd obm obn obo obs oda odb odd odm odn odo ods om- oma omb omd omm omn omo oms on- ona onb ond onn ono ons oo- ooa oob ood oom oon ooo oos os- osa osb osd osm osn oso oss saa sab sad sam san sao sas sba sbb sbd sbm sbn sbo sbs sda sdb sdd sdm sdn sdo sds sma smb smd smm smn smo sms sna snb snd snm snn sno sns soa sob sod som son soo sos ss- ssa ssb ssd ssm ssn sso sss