a-a a-c aaa aac aad aak aao aap aar aas ac- aca acc acd ack aco acp acr acs ad- ada adc add adk ado adp adr ads aka akc akd akk ako akp akr aks aoa aoc aod aok aoo aop aor aos ap- apa apc apd apk apo app apr aps ar- ara arc ard ark aro arp arr ars as- asa asc asd ask aso asp asr ass c-- caa cac cad cak cao cap car cas cca ccc ccd cck cco ccp ccr ccs cda cdc cdd cdk cdo cdp cdr cds cka ckc ckd cko cks co- coa coc cod cok coo cop cor cos cpa cpc cpd cpk cpo cpp cpr cps cra crc crd crk cro crp crr crs csa csc csd csk cso csp csr css daa dac dad dak dao dap dar das dca dcc dcd dck dco dcp dcr dcs dda ddc ddd ddk ddo ddp ddr dds dka dkc dkk dko dkp dkr dks doa doc dod dok doo dop dor dos dpa dpc dpd dpk dpo dpp dpr dps dra drc drd drk dro drp drr drs dsa dsc dsd dsk dso dsp dsr dss ka- kaa kac kad kak kao kap kar kas kca kcc kcd kck kcp kcr kcs kda kdc kdk kdo kdp kdr kds kkc kkk kkp kkr kks koa koc kod kok koo kop kor kos kpa kpc kpd kpk kpo kpp kpr kps kra krc krd krk kro krp krr krs ksa ksc ksd ksk kso ksp ksr kss oaa oac oad oak oao oap oar oas oc- oca occ ocd ock oco ocp ocr ocs oda odc odd odo odp odr ods oka okc okd okk oko okp okr oks oo- ooa ooc ood ook ooo oop oor oos op- opa opc opd opk opo opp opr ops or- ora orc ord ork oro orp orr ors os- osa osc osd osk oso osp osr oss p-p paa pac pad pak pao pap par pas pca pcc pcd pck pco pcp pcr pcs pda pdc pdd pdk pdo pdp pdr pds pka pkc pkd pko pkp pkr pks poa poc pod pok poo pop por pos ppa ppc ppd ppk ppo ppp ppr pps pra prc prd prk pro prp prr prs ps- psa psc psd psk pso psp psr pss ra- raa rac rad rak rao rap rar ras rca rcc rcd rco rcp rcr rcs rda rdc rdd rdo rdp rdr rds rkc rkk rko rkp rks roa roc rod rok roo rop ror ros rpa rpc rpd rpk rpo rpp rpr rps rra rrc rrd rrk rrp rrr rrs rsa rsc rsd rsk rso rsp rsr rss saa sac sad sak sao sap sar sas sca scc scd sck sco scp scr scs sda sdc sdd sdk sdo sdp sdr sds sk- ska skc skd skk sko skp skr sks soa soc sod sok soo sop sor sos spa spc spd spk spo spp spr sps sr- sra src srd srk sro srp srr srs ss- ssa ssc ssd ssk sso ssp ssr sss