a-a a-c aaa aac aad aak aan aao aar aas ac- aca acc acd ack acn aco acr acs ad- ada adc add adk adn ado adr ads aka akc akd akk akn ako akr aks an- ana anc and ank ann ano anr ans aoa aoc aod aok aon aoo aor aos ar- ara arc ard ark arn aro arr ars as- asa asc asd ask asn aso asr ass c-- caa cac cad cak can cao car cas cca ccc ccd cck ccn cco ccr ccs cda cdc cdd cdk cdn cdo cdr cds cka ckc ckd cko cks cn- cna cnc cnd cnn cno cnr cns co- coa coc cod cok con coo cor cos cra crc crd crk crn cro crr crs csa csc csd csk csn cso csr css daa dac dad dak dan dao dar das dca dcc dcd dck dcn dco dcr dcs dda ddc ddd ddk ddn ddo ddr dds dka dkc dkk dko dkr dks dna dnc dnd dnk dnn dno dnr dns doa doc dod dok don doo dor dos dra drc drd drk drn dro drr drs dsa dsc dsd dsk dsn dso dsr dss ka- kaa kac kad kak kan kao kar kas kca kcc kcd kck kcn kcr kcs kda kdc kdk kdo kdr kds kkc kkk kkn kkr kks kn- kna knc knd knk knn kno knr koa koc kod kok kon koo kor kos kra krc krd krk krn kro krr krs ksa ksc ksd ksk ksn kso ksr kss naa nac nad nak nan nao nar nas nca ncc ncd nck ncn nco ncr ncs nda ndc ndd ndk ndn ndo ndr nds nka nkc nkk nkn nko nkr nks nna nnc nnk nnn nno nns no- noa noc nod nok non noo nor nos nra nrc nrd nrk nrn nro nrr nrs nsa nsc nsd nsk nsn nso nsr nss oaa oac oad oak oan oao oar oas oc- oca occ ocd ock ocn oco ocr ocs oda odc odd odn odo odr ods oka okc okd okk oko okr oks on- ona onc ond onk onn ono onr ons oo- ooa ooc ood ook oon ooo oor oos or- ora orc ord ork orn oro orr ors os- osa osc osd osk osn oso osr oss ra- raa rac rad rak ran rao rar ras rca rcc rcd rcn rco rcr rcs rda rdc rdd rdn rdo rdr rds rkc rkk rko rks rna rnc rnd rnn rno rnr rns roa roc rod rok ron roo ror ros rra rrc rrd rrk rrn rrr rrs rsa rsc rsd rsk rsn rso rsr rss saa sac sad sak san sao sar sas sca scc scd sck scn sco scr scs sda sdc sdd sdk sdn sdo sdr sds sk- ska skc skd skk sko skr sks sna snc snd snk snn sno snr sns soa soc sod sok son soo sor sos sr- sra src srd srk srn sro srr srs ss- ssa ssc ssd ssk ssn sso ssr sss