a-a a-c a-t aaa aac aad aak aao aar aas aat ac- aca acc acd ack aco acr acs act ad- ada adc add adk ado adr ads adt aka akc akd akk ako akr aks aoa aoc aod aok aoo aor aos aot ar- ara arc ard ark aro arr ars art as- asa asc asd ask aso asr ass ast at- ata atc atd ato atr ats att c-- caa cac cad cak cao car cas cat cca ccc ccd cck cco ccr ccs cct cda cdc cdd cdk cdo cdr cds cdt cka ckc ckd cko cks ckt co- coa coc cod cok coo cor cos cot cra crc crd crk cro crr crs crt csa csc csd csk cso csr css cst cta ctc ctd ctk cto ctr cts ctt daa dac dad dak dao dar das dat dca dcc dcd dck dco dcr dcs dct dda ddc ddd ddk ddo ddr dds ddt dka dkc dkk dko dkr dks dkt doa doc dod dok doo dor dos dot dra drc drd drk dro drr drs drt dsa dsc dsd dsk dso dsr dss dst dta dtc dtd dtk dto dtr dts dtt k-t ka- kaa kac kad kak kao kar kas kat kca kcc kcd kck kcr kcs kct kda kdc kdk kdo kdr kds kdt kkc kkk kkr kks kkt koa koc kod kok koo kor kos kot kra krc krd krk kro krr krs krt ksa ksc ksd ksk kso ksr kss kst kta ktc ktk kto ktr kts ktt oaa oac oad oak oao oar oas oat oc- oca occ ocd ock oco ocr ocs oct oda odc odd odo odr ods odt oka okc okd okk oko okr oks oo- ooa ooc ood ook ooo oor oos oot or- ora orc ord ork oro orr ors ort os- osa osc osd osk oso osr oss ost ot- ota otc otd otk oto otr ots ott ra- raa rac rad rak rao rar ras rat rca rcc rcd rco rcr rcs rct rda rdc rdd rdo rdr rds rdt rkc rkk rko rks rkt roa roc rod rok roo ror ros rot rra rrc rrd rrk rrr rrs rrt rsa rsc rsd rsk rso rsr rss rst rta rtc rtd rtk rto rtr rts rtt saa sac sad sak sao sar sas sat sca scc scd sck sco scr scs sct sda sdc sdd sdk sdo sdr sds sdt sk- ska skc skd skk sko skr sks skt soa soc sod sok soo sor sos sot sr- sra src srd srk sro srr srs srt ss- ssa ssc ssd ssk sso ssr sss sst sta stc std stk sto str sts stt taa tac tad tak tao tar tas tat tca tcc tcd tck tco tcr tcs tct tda tdc tdd tdk tdo tdr tds tdt tka tkc tkk tko tkr tks tkt to- toa toc tod tok too tor tos tot tra trc trd trk tro trr trs trt tsa tsc tsd tsk tso tsr tss tst tta ttc ttd ttk tto ttr tts ttt