-er a-a a-b a-c a-t aaa aab aac aae aak aap aar aat aax ab- aba abb abc abe abk abp abr abt abx ac- aca acb acc ace ack acp acr act acx aea aeb aec aee aek aep aer aet aex aka akb akc ake akk akp akr ap- apa apb apc ape apk app apr apt apx ar- ara arb arc are ark arp arr art arx at- ata atb atc ate atp atr att atx ax- axa axe axk axp axr axt axx b-p baa bab bac bae bak bap bar bat bax bba bbb bbc bbe bbk bbp bbr bbt bbx bca bcb bcc bce bck bcp bcr bct bcx be- bea beb bec bee bek bep ber bet bex bka bkb bkc bke bkk bkp bkr bkt bkx bpa bpb bpc bpe bpp bpr bpt bpx bra brb bre brk brp brr brt brx bta btb btc bte btk btp btr btt btx bxb bxx c-- caa cab cac cae cak cap car cat cax cba cbb cbc cbe cbk cbp cbr cbt cbx cca ccb ccc cce cck ccp ccr cct ccx ce- cea ceb cec cee cek cep cer cet cex cka ckb ckc ckt ckx cpa cpb cpc cpe cpk cpp cpr cpt cpx cra crb crc cre crk crp crr crt crx cta ctb ctc cte ctk ctp ctr ctt ctx cxc cxk cxp cxr cxt cxx eaa eab eac eae eak eap ear eat eax eba ebb ebc ebe ebk ebp ebr ebt ebx ec- eca ecb ecc ece eck ecr ect ecx eea eeb eec eee eek eep eer eet eex eka ekb ekc eke ekp ekr ekt ep- epa epb epc epe epp epr ept epx era erb erc ere erk erp err ert eta etb etc ete etk etp etr ett etx ex- exa exc exe exp exr ext exx k-t ka- kaa kab kac kae kak kap kar kat kax kba kbb kbc kbe kbk kbp kbr kbx kca kcb kcc kce kck kcp kcr kct kcx ke- kea keb kec kee kek kep ker ket kex kkb kkc kke kkk kkp kkr kkt kpa kpc kpe kpk kpp kpr kpt kra krc krk krp krr krt kta ktb ktc kte ktk ktp ktr ktt p-p paa pab pac pae pak pap par pat pax pba pbb pbc pbe pbk pbp pbr pbt pbx pca pcb pcc pce pck pcp pcr pct pcx pea peb pec pee pek pep per pet pex pka pkb pkc pke pkp pkr pkt ppa ppb ppc ppe ppk ppp ppr ppt ppx pra prb prc pre prk prp prr prt prx pt- pta ptb ptc pte ptk ptp ptr ptt ptx pxc pxe pxk pxr pxt ra- raa rab rac rae rak rap rar rat rax rba rbb rbc rbe rbk rbp rbr rbt rbx rca rcb rcc rce rcp rcr rct rcx re- rea reb rec ree rek rep rer ret rex rkb rkc rke rkk rkp rkt rpa rpb rpc rpe rpk rpp rpr rpt rpx rra rrb rrc rrk rrp rrr rrt rta rtb rtc rte rtk rtp rtr rtt rtx rxp rxr t-x taa tab tac tae tak tap tar tat tax tba tbb tbc tbe tbk tbp tbr tbt tca tcb tcc tce tck tcp tcr tct tcx te- tea teb tec tee tek tep ter tet tex tka tkb tkc tke tkk tkp tkr tkt tpa tpb tpc tpe tpk tpp tpr tpt tpx tra trb trc tre trk trp trr trt trx tta ttb ttc tte ttk ttp ttr ttt ttx txe txk txt xaa xac xak xap xar xat xbc xbe xbr xbx xcb xcp xcr xcx xee xep xer xet xex xkb xke xpa xpb xpc xpe xpp xpt xrc xrt xrx xtc xtp xtr xtx xxp xxx

a-ak a-be aaaa aaab aaac aaae aaap aaar aaba aabb aabc aabp aabt aaca aacb aacc aace aack aacp aacr aact aaea aaec aaep aaka aake aapa aapc aapt aara aarc aare aarp aart aata aatc aatk aatt abaa abab abac abae abak abap abar abat abax abb- abba abbb abbe abbr abbt abca abcb abcc abcp abcr abct abec abee aber abet abpa abpc abpp abpr abra abrc abta ac-t acaa acab acac acae acap acar acat acba acca accc acce accp acct ace- acea acec acek acer acet acke acpa acpe acpr acpt acr- acra acrc acre acrr acta actc acte actt aeac aeap aecb aect aeer aeka aer- aera aerc aeta aetc aetr aett aetx akaa akae akap akar akca akee aker akka akr- akra akre akte apac apak apap apar apat apax apba apbr apca apcb apcc apcr apea apec apep aper apet apex apke appa appc appr appt appx apra aprc apre aprt apta aptc apte aptt aptx arab arac arae arak arap arar arat arax arba arbe arc- arca arce arct area arec aree arek arep aret arex arka arke arpa arpe arr- arra arrc arre arrk arrr arrt arta artc arte artr artx at-t at-x ataa atab atac atae atak atap atar atat atax atca atcc atck atcr atea atec atee atep ater atex atka atkt atpr atra atrc atre atrk atrp atrx atta atte attp attr axar axat axce axer ba-x baaa baak baar baat baba babb babe babr bac- baca bacc bace back bact baek baer bak- baka bake bakr bakt bapa bapc bape bapp bapt bar- bara barb barc bare bark barr bart barx bata batc bate batt baxt bbbb bbeb bbet bbpr bbrc bcaa bcap bcar bcat bcbc bcbp bcca bccc bcec bcer bcet bcpp bcra bctc beak beap bear beat beba bebb bebe beca beck beeb beek beep beer beet beka beke bera berc bere berk berr bert beta betc bete bett bkpr bkpt bpcp bpea bprc brab brac brae brak brat brax brca brcb brce brea breb brec bree brek brep brer bret brex brka brkb brrr brtc btaa btbp btcc btcx btec btek btex btrc btrt bttb caaa