a-a a-b aaa aab aad aam aan aas ab- aba abb abd abm abn abs ad- ada adb add adm adn ads ama amb amd amm amn ams an- ana anb and anm ann ans as- asa asb asd asm asn ass baa bab bad bam ban bas bba bbb bbd bbm bbn bbs bda bdb bdd bdm bds bma bmb bmd bmm bmn bms bna bnb bnd bnn bns bsa bsb bsd bsm bsn bss daa dab dad dam dan das dba dbb dbd dbm dbn dbs dda ddb ddd ddm ddn dds dma dmb dmd dmm dmn dms dna dnb dnd dnm dnn dns dsa dsb dsd dsm dsn dss maa mab mad mam man mas mba mbb mbd mbm mbs mda mdb mdd mdm mdn mds mma mmb mmd mmm mmn mms mna mnb mnm mnn mns msa msb msd msm msn mss naa nab nad nam nan nas nba nbb nbd nbm nbn nbs nda ndb ndd ndm ndn nds nma nmb nmd nmm nmn nms nna nnb nnm nnn nns nsa nsb nsd nsm nsn nss saa sab sad sam san sas sba sbb sbd sbm sbn sbs sda sdb sdd sdm sdn sds sma smb smd smm smn sms sna snb snd snm snn sns ss- ssa ssb ssd ssm ssn sss