a-a a-c a-t aaa aac aaf aak aar aas aat ac- aca acc acf ack acr acs act af- afa afc aff afk afr afs aft aka akc akk akr aks ar- ara arc arf ark arr ars art as- asa asc asf ask asr ass ast at- ata atc atf atr ats att c-- caa cac caf cak car cas cat cca ccc ccf cck ccr ccs cct cfa cfc cff cfk cfr cfs cft cka ckc cks ckt cra crc crf crk crr crs crt csa csc csf csk csr css cst cta ctc ctf ctk ctr cts ctt faa fac faf fak far fas fat fca fcc fcf fck fcr fcs fct ffa ffc fff ffk ffr ffs fft fka fkc fkf fkk fkt fra frc frf frk frr frs frt fsa fsc fsf fsk fsr fss fst fta ftc ftf ftk ftr fts ftt k-t ka- kaa kac kaf kak kar kas kat kca kcc kck kcr kcs kct kfa kfc kff kfs kkc kkk kkr kks kkt kra krc krf krk krr krs krt ksa ksc ksf ksk ksr kss kst kta ktc ktf ktk ktr kts ktt ra- raa rac raf rak rar ras rat rca rcc rcf rcr rcs rct rfa rfc rff rfk rfr rfs rft rkc rkf rkk rks rkt rra rrc rrf rrk rrr rrs rrt rsa rsc rsf rsk rsr rss rst rta rtc rtf rtk rtr rts rtt saa sac saf sak sar sas sat sca scc scf sck scr scs sct sfa sfc sff sfk sfr sfs sft sk- ska skc skf skk skr sks skt sr- sra src srf srk srr srs srt ss- ssa ssc ssf ssk ssr sss sst sta stc stf stk str sts stt taa tac taf tak tar tas tat tca tcc tcf tck tcr tcs tct tfa tfc tff tfk tfr tfs tft tka tkc tkk tkr tks tkt tra trc trf trk trr trs trt tsa tsc tsf tsk tsr tss tst tta ttc ttf ttk ttr tts ttt