a-a a-b a-c aaa aab aac aad aam aan aar aas ab- aba abb abc abd abm abn abr abs ac- aca acb acc acd acm acn acr acs ad- ada adb adc add adm adn adr ads ama amb amc amd amm amn amr ams an- ana anb anc and anm ann anr ans ar- ara arb arc ard arm arn arr ars as- asa asb asc asd asm asn asr ass baa bab bac bad bam ban bar bas bba bbb bbc bbd bbm bbn bbr bbs bca bcb bcc bcd bcm bcn bcr bcs bda bdb bdc bdd bdm bdr bds bma bmb bmc bmd bmm bmn bmr bms bna bnb bnc bnd bnn bnr bns bra brb brd brm brn brr brs bsa bsb bsc bsd bsm bsn bsr bss c-- caa cab cac cad cam can car cas cba cbb cbc cbd cbm cbn cbr cbs cca ccb ccc ccd ccm ccn ccr ccs cda cdb cdc cdd cdm cdn cdr cds cma cmb cmc cmd cmm cmn cmr cms cn- cna cnb cnc cnd cnm cnn cnr cns cra crb crc crd crm crn crr crs csa csb csc csd csm csn csr css daa dab dac dad dam dan dar das dba dbb dbc dbd dbm dbn dbr dbs dca dcb dcc dcd dcm dcn dcr dcs dda ddb ddc ddd ddm ddn ddr dds dma dmb dmc dmd dmm dmn dmr dms dna dnb dnc dnd dnm dnn dnr dns dra drb drc drd drm drn drr drs dsa dsb dsc dsd dsm dsn dsr dss m-r maa mab mac mad mam man mar mas mba mbb mbc mbd mbm mbr mbs mc- mca mcb mcc mcd mcm mcn mcr mcs mda mdb mdc mdd mdm mdn mdr mds mma mmb mmc mmd mmm mmn mmr mms mna mnb mnc mnm mnn mnr mns mra mrb mrc mrd mrm mrn mrr mrs msa msb msc msd msm msn msr mss naa nab nac nad nam nan nar nas nba nbb nbc nbd nbm nbn nbr nbs nca ncb ncc ncd ncm ncn ncr ncs nda ndb ndc ndd ndm ndn ndr nds nma nmb nmc nmd nmm nmn nmr nms nna nnb nnc nnm nnn nns nra nrb nrc nrd nrm nrn nrr nrs nsa nsb nsc nsd nsm nsn nsr nss ra- raa rab rac rad ram ran rar ras rba rbb rbc rbd rbm rbn rbr rbs rca rcb rcc rcd rcm rcn rcr rcs rda rdb rdc rdd rdm rdn rdr rds rma rmb rmc rmd rmm rmn rmr rms rna rnb rnc rnd rnm rnn rnr rns rra rrb rrc rrd rrm rrn rrr rrs rsa rsb rsc rsd rsm rsn rsr rss saa sab sac sad sam san sar sas sba sbb sbc sbd sbm sbn sbr sbs sca scb scc scd scm scn scr scs sda sdb sdc sdd sdm sdn sdr sds sma smb smc smd smm smn smr sms sna snb snc snd snm snn snr sns sr- sra srb src srd srm srn srr srs ss- ssa ssb ssc ssd ssm ssn ssr sss