a-a a-b a-c a-t aaa aab aac aak aap aar aas aat ab- aba abb abc abk abp abr abs abt ac- aca acb acc ack acp acr acs act aka akb akc akk akp akr aks ap- apa apb apc apk app apr aps apt ar- ara arb arc ark arp arr ars art as- asa asb asc ask asp asr ass ast at- ata atb atc atp atr ats att b-p baa bab bac bak bap bar bas bat bba bbb bbc bbk bbp bbr bbs bbt bca bcb bcc bck bcp bcr bcs bct bka bkb bkc bkk bkp bkr bks bkt bpa bpb bpc bpp bpr bps bpt bra brb brk brp brr brs brt bsa bsb bsc bsk bsp bsr bss bst bta btb btc btk btp btr bts btt c-- caa cab cac cak cap car cas cat cba cbb cbc cbk cbp cbr cbs cbt cca ccb ccc cck ccp ccr ccs cct cka ckb ckc cks ckt cpa cpb cpc cpk cpp cpr cps cpt cra crb crc crk crp crr crs crt csa csb csc csk csp csr css cst cta ctb ctc ctk ctp ctr cts ctt k-t ka- kaa kab kac kak kap kar kas kat kba kbb kbc kbk kbp kbr kbs kca kcb kcc kck kcp kcr kcs kct kkb kkc kkk kkp kkr kks kkt kpa kpc kpk kpp kpr kps kpt kra krc krk krp krr krs krt ksa ksb ksc ksk ksp ksr kss kst kta ktb ktc ktk ktp ktr kts ktt p-p paa pab pac pak pap par pas pat pba pbb pbc pbk pbp pbr pbs pbt pca pcb pcc pck pcp pcr pcs pct pka pkb pkc pkp pkr pks pkt ppa ppb ppc ppk ppp ppr pps ppt pra prb prc prk prp prr prs prt ps- psa psb psc psk psp psr pss pst pt- pta ptb ptc ptk ptp ptr pts ptt ra- raa rab rac rak rap rar ras rat rba rbb rbc rbk rbp rbr rbs rbt rca rcb rcc rcp rcr rcs rct rkb rkc rkk rkp rks rkt rpa rpb rpc rpk rpp rpr rps rpt rra rrb rrc rrk rrp rrr rrs rrt rsa rsb rsc rsk rsp rsr rss rst rta rtb rtc rtk rtp rtr rts rtt saa sab sac sak sap sar sas sat sba sbb sbc sbk sbp sbr sbs sbt sca scb scc sck scp scr scs sct sk- ska skb skc skk skp skr sks skt spa spb spc spk spp spr sps spt sr- sra srb src srk srp srr srs srt ss- ssa ssb ssc ssk ssp ssr sss sst sta stb stc stk stp str sts stt taa tab tac tak tap tar tas tat tba tbb tbc tbk tbp tbr tbs tbt tca tcb tcc tck tcp tcr tcs tct tka tkb tkc tkk tkp tkr tks tkt tpa tpb tpc tpk tpp tpr tps tpt tra trb trc trk trp trr trs trt tsa tsb tsc tsk tsp tsr tss tst tta ttb ttc ttk ttp ttr tts ttt