a-a a-c a-t aaa aac aak aan aar aas aat ac- aca acc ack acn acr acs act aka akc akk akn akr aks an- ana anc ank ann anr ans ant ar- ara arc ark arn arr ars art as- asa asc ask asn asr ass ast at- ata atc atn atr ats att c-- caa cac cak can car cas cat cca ccc cck ccn ccr ccs cct cka ckc cks ckt cn- cna cnc cnn cnr cns cnt cra crc crk crn crr crs crt csa csc csk csn csr css cst cta ctc ctk ctn ctr cts ctt k-t ka- kaa kac kak kan kar kas kat kca kcc kck kcn kcr kcs kct kkc kkk kkn kkr kks kkt kn- kna knc knk knn knr knt kra krc krk krn krr krs krt ksa ksc ksk ksn ksr kss kst kta ktc ktk ktn ktr kts ktt naa nac nak nan nar nas nat nca ncc nck ncn ncr ncs nct nka nkc nkk nkn nkr nks nkt nna nnc nnk nnn nns nnt nra nrc nrk nrn nrr nrs nrt nsa nsc nsk nsn nsr nss nst nta ntc ntk ntn ntr nts ntt ra- raa rac rak ran rar ras rat rca rcc rcn rcr rcs rct rkc rkk rks rkt rna rnc rnn rnr rns rnt rra rrc rrk rrn rrr rrs rrt rsa rsc rsk rsn rsr rss rst rta rtc rtk rtn rtr rts rtt saa sac sak san sar sas sat sca scc sck scn scr scs sct sk- ska skc skk skr sks skt sna snc snk snn snr sns snt sr- sra src srk srn srr srs srt ss- ssa ssc ssk ssn ssr sss sst sta stc stk stn str sts stt taa tac tak tan tar tas tat tca tcc tck tcn tcr tcs tct tka tkc tkk tkr tks tkt tna tnc tnk tnn tnr tns tnt tra trc trk trn trr trs trt tsa tsc tsk tsn tsr tss tst tta ttc ttk ttn ttr tts ttt