a-a a-b a-c a-t aaa aab aac aak aap aar aat ab- aba abb abc abk abp abr abt ac- aca acb acc ack acp acr act aka akb akc akk akp akr ap- apa apb apc apk app apr apt ar- ara arb arc ark arp arr art at- ata atb atc atp atr att b-p baa bab bac bak bap bar bat bba bbb bbc bbk bbp bbr bbt bca bcb bcc bck bcp bcr bct bka bkb bkc bkk bkp bkr bkt bpa bpb bpc bpp bpr bpt bra brb brk brp brr brt bta btb btc btk btp btr btt c-- caa cab cac cak cap car cat cba cbb cbc cbk cbp cbr cbt cca ccb ccc cck ccp ccr cct cka ckb ckc ckt cpa cpb cpc cpk cpp cpr cpt cra crb crc crk crp crr crt cta ctb ctc ctk ctp ctr ctt k-t ka- kaa kab kac kak kap kar kat kba kbb kbc kbk kbp kbr kca kcb kcc kck kcp kcr kct kkb kkc kkk kkp kkr kkt kpa kpc kpk kpp kpr kpt kra krc krk krp krr krt kta ktb ktc ktk ktp ktr ktt p-p paa pab pac pak pap par pat pba pbb pbc pbk pbp pbr pbt pca pcb pcc pck pcp pcr pct pka pkb pkc pkp pkr pkt ppa ppb ppc ppk ppp ppr ppt pra prb prc prk prp prr prt pt- pta ptb ptc ptk ptp ptr ptt ra- raa rab rac rak rap rar rat rba rbb rbc rbk rbp rbr rbt rca rcb rcc rcp rcr rct rkb rkc rkk rkp rkt rpa rpb rpc rpk rpp rpr rpt rra rrb rrc rrk rrp rrr rrt rta rtb rtc rtk rtp rtr rtt taa tab tac tak tap tar tat tba tbb tbc tbk tbp tbr tbt tca tcb tcc tck tcp tcr tct tka tkb tkc tkk tkp tkr tkt tpa tpb tpc tpk tpp tpr tpt tra trb trc trk trp trr trt tta ttb ttc ttk ttp ttr ttt