a-a a-b a-c a-t aaa aab aac aak aao aap aar aat ab- aba abb abc abk abo abp abr abt ac- aca acb acc ack aco acp acr act aka akb akc akk ako akp akr aoa aob aoc aok aoo aop aor aot ap- apa apb apc apk apo app apr apt ar- ara arb arc ark aro arp arr art at- ata atb atc ato atp atr att b-p baa bab bac bak bao bap bar bat bba bbb bbc bbk bbo bbp bbr bbt bca bcb bcc bck bco bcp bcr bct bka bkb bkc bkk bko bkp bkr bkt boa bob boc bok boo bop bor bot bpa bpb bpc bpo bpp bpr bpt bra brb brk bro brp brr brt bta btb btc btk bto btp btr btt c-- caa cab cac cak cao cap car cat cba cbb cbc cbk cbo cbp cbr cbt cca ccb ccc cck cco ccp ccr cct cka ckb ckc cko ckt co- coa cob coc cok coo cop cor cot cpa cpb cpc cpk cpo cpp cpr cpt cra crb crc crk cro crp crr crt cta ctb ctc ctk cto ctp ctr ctt k-t ka- kaa kab kac kak kao kap kar kat kba kbb kbc kbk kbo kbp kbr kca kcb kcc kck kcp kcr kct kkb kkc kkk kkp kkr kkt koa kob koc kok koo kop kor kot kpa kpc kpk kpo kpp kpr kpt kra krc krk kro krp krr krt kta ktb ktc ktk kto ktp ktr ktt oaa oab oac oak oao oap oar oat ob- oba obb obc obk obo obp obr obt oc- oca ocb occ ock oco ocp ocr oct oka okb okc okk oko okp okr oo- ooa oob ooc ook ooo oop oor oot op- opa opb opc opk opo opp opr opt or- ora orb orc ork oro orp orr ort ot- ota otb otc otk oto otp otr ott p-p paa pab pac pak pao pap par pat pba pbb pbc pbk pbo pbp pbr pbt pca pcb pcc pck pco pcp pcr pct pka pkb pkc pko pkp pkr pkt poa pob poc pok poo pop por pot ppa ppb ppc ppk ppo ppp ppr ppt pra prb prc prk pro prp prr prt pt- pta ptb ptc ptk pto ptp ptr ptt ra- raa rab rac rak rao rap rar rat rba rbb rbc rbk rbo rbp rbr rbt rca rcb rcc rco rcp rcr rct rkb rkc rkk rko rkp rkt roa rob roc rok roo rop ror rot rpa rpb rpc rpk rpo rpp rpr rpt rra rrb rrc rrk rrp rrr rrt rta rtb rtc rtk rto rtp rtr rtt taa tab tac tak tao tap tar tat tba tbb tbc tbk tbo tbp tbr tbt tca tcb tcc tck tco tcp tcr tct tka tkb tkc tkk tko tkp tkr tkt to- toa tob toc tok too top tor tot tpa tpb tpc tpk tpo tpp tpr tpt tra trb trc trk tro trp trr trt tta ttb ttc ttk tto ttp ttr ttt

a-ak a-ok aaaa aaab aaac aaap aaar aaba aabb aabc aabp aabt aaca aacb aacc aack aaco aacp aacr aact aaka aaoo aapa aapc aapo aapt aara aarc aaro aarp aart aata aatc aatk aatt abaa abab abac abak abap abar abat abb- abba abbb abbo abbr abbt abca abcb abcc abcp abcr abct aboa abob abok aboo abor abot abpa abpc abpp abpr abra abrc abro abta ac-t acaa acab acac acap acar acat acba acca accc acco accp acct acoa acop acor acot acpa acpr acpt acr- acra acrc acro acrr acta actc acto actt akaa akao akap akar akca akka akko akok akot akpo akr- akra aoba aoca aokp aopo aora aorb aort aotc apac apak apao apap apar apat apba apbr apca apcb apcc apco apcr apo- apoc apoo apop apor apot appa appc appr appt apra aprc apro aprt apta aptc aptt arab arac arak arap arar arat arba arc- arca arco arct arka arko aroa arob aroo aror arpa arr- arra arrc arrk arro arrr arrt arta artc arto artr at-t ataa atab atac atak atap atar atat atca atcc atck atco atcr atka atkt atob atoc atok atop ator atot atpr atra atrc atrk atro atrp atta atto attp attr baaa baak baar baat baba babb babo babr bac- baca bacc back baco bact bak- baka bako bakr bakt bapa bapc bapp bapt bar- bara barb barc bark baro barr bart bata batc bato batt bbbb bbpr bbrc bcaa bcap bcar bcat bcbc bcbp bcca bccc bcor bcpp bcra bctc bkpr bkpt boab boac boak boar boat boba bobb bobo boca bock boco boka boko boob booc book boop boor boot bopa bopp bor- bora bork boro borr bort bota botb boto bott bpcp bpot bprc brab brac brak brao brat brca brcb brka brkb broa brob broc brok broo bror brot brrr brtc btaa btbp btcc btob btor btrc btrt bttb c-bo caaa caab caac caap caat caba cabo cac- caca cacc cack caco cacr caka caor capa capb capc capo capp capt cara carb carc cark caro carp carr cart cat- cata catb catc cato catt cbac cbar cbat cbbc cbca cbcc cbcp cbcr cbct cbka cbko cbkr cbot cbpc cbpp cbrt cbta cbtc ccaa ccab ccac ccap ccar ccat ccba ccbc ccca cccb cccc cccp ccob ccoc ccpa ccpp ccpr ccra ccrc ccrp ccrt cctb cctc cctt ckac ckat ckbc ckck ckco ckoa ckob ckoc ckoo ckor ckot ckpc ckpr ckrc cktb coak coat coba cobb cobo coca cock coco cocp coct cok- coka coko coob cook coop coot copa copo copp copr copt cor- cora corb corc cork coro corp corr cort cota cotb cotc coto cott cpaa cpac cpap cpbc cpca cppa cprt cptp cptr crab crac crap crar crat crbc crca crcc crcr crkc crkp crob croc crok croo crop cror crot crpc crrt crtc crtp ctab ctba ctca ctcp