a-a a-b a-c aaa aab aac aad aak aao aap aar aas ab- aba abb abc abd abk abo abp abr abs ac- aca acb acc acd ack aco acp acr acs ad- ada adb adc add adk ado adp adr ads aka akb akc akd akk ako akp akr aks aoa aob aoc aod aok aoo aop aor aos ap- apa apb apc apd apk apo app apr aps ar- ara arb arc ard ark aro arp arr ars as- asa asb asc asd ask aso asp asr ass b-p baa bab bac bad bak bao bap bar bas bba bbb bbc bbd bbk bbo bbp bbr bbs bca bcb bcc bcd bck bco bcp bcr bcs bda bdb bdc bdd bdk bdo bdp bdr bds bka bkb bkc bkk bko bkp bkr bks boa bob boc bod bok boo bop bor bos bpa bpb bpc bpd bpo bpp bpr bps bra brb brd brk bro brp brr brs bsa bsb bsc bsd bsk bso bsp bsr bss c-- caa cab cac cad cak cao cap car cas cba cbb cbc cbd cbk cbo cbp cbr cbs cca ccb ccc ccd cck cco ccp ccr ccs cda cdb cdc cdd cdk cdo cdp cdr cds cka ckb ckc ckd cko cks co- coa cob coc cod cok coo cop cor cos cpa cpb cpc cpd cpk cpo cpp cpr cps cra crb crc crd crk cro crp crr crs csa csb csc csd csk cso csp csr css daa dab dac dad dak dao dap dar das dba dbb dbc dbd dbk dbo dbp dbr dbs dca dcb dcc dcd dck dco dcp dcr dcs dda ddb ddc ddd ddk ddo ddp ddr dds dka dkb dkc dkk dko dkp dkr dks doa dob doc dod dok doo dop dor dos dpa dpb dpc dpd dpk dpo dpp dpr dps dra drb drc drd drk dro drp drr drs dsa dsb dsc dsd dsk dso dsp dsr dss ka- kaa kab kac kad kak kao kap kar kas kba kbb kbc kbd kbk kbo kbp kbr kbs kca kcb kcc kcd kck kcp kcr kcs kda kdb kdc kdk kdo kdp kdr kds kkb kkc kkk kkp kkr kks koa kob koc kod kok koo kop kor kos kpa kpc kpd kpk kpo kpp kpr kps kra krc krd krk kro krp krr krs ksa ksb ksc ksd ksk kso ksp ksr kss oaa oab oac oad oak oao oap oar oas ob- oba obb obc obd obk obo obp obr obs oc- oca ocb occ ocd ock oco ocp ocr ocs oda odb odc odd odo odp odr ods oka okb okc okd okk oko okp okr oks oo- ooa oob ooc ood ook ooo oop oor oos op- opa opb opc opd opk opo opp opr ops or- ora orb orc ord ork oro orp orr ors os- osa osb osc osd osk oso osp osr oss p-p paa pab pac pad pak pao pap par pas pba pbb pbc pbd pbk pbo pbp pbr pbs pca pcb pcc pcd pck pco pcp pcr pcs pda pdb pdc pdd pdk pdo pdp pdr pds pka pkb pkc pkd pko pkp pkr pks poa pob poc pod pok poo pop por pos ppa ppb ppc ppd ppk ppo ppp ppr pps pra prb prc prd prk pro prp prr prs ps- psa psb psc psd psk pso psp psr pss ra- raa rab rac rad rak rao rap rar ras rba rbb rbc rbd rbk rbo rbp rbr rbs rca rcb rcc rcd rco rcp rcr rcs rda rdb rdc rdd rdo rdp rdr rds rkb rkc rkk rko rkp rks roa rob roc rod rok roo rop ror ros rpa rpb rpc rpd rpk rpo rpp rpr rps rra rrb rrc rrd rrk rrp rrr rrs rsa rsb rsc rsd rsk rso rsp rsr rss saa sab sac sad sak sao sap sar sas sba sbb sbc sbd sbk sbo sbp sbr sbs sca scb scc scd sck sco scp scr scs sda sdb sdc sdd sdk sdo sdp sdr sds sk- ska skb skc skd skk sko skp skr sks soa sob soc sod sok soo sop sor sos spa spb spc spd spk spo spp spr sps sr- sra srb src srd srk sro srp srr srs ss- ssa ssb ssc ssd ssk sso ssp ssr sss