-er a-a a-b a-c a-t aaa aab aac aae aak aar aat aav ab- aba abb abc abe abk abr abt abv ac- aca acb acc ace ack acr act acv aea aeb aec aee aek aer aet aev aka akb akc ake akk akr akv ar- ara arb arc are ark arr art arv at- ata atb atc ate atr att atv av- ava avb avc ave avk avr avt baa bab bac bae bak bar bat bav bba bbb bbc bbe bbk bbr bbt bca bcb bcc bce bck bcr bct bcv be- bea beb bec bee bek ber bet bev bka bkb bkc bke bkk bkr bkt bkv bra brb bre brk brr brt brv bta btb btc bte btk btr btt btv bva bvb bvc bve bvk bvr bvt bvv c-- caa cab cac cae cak car cat cav cba cbb cbc cbe cbk cbr cbt cbv cca ccb ccc cce cck ccr cct ccv ce- cea ceb cec cee cek cer cet cev cka ckb ckc ckt cra crb crc cre crk crr crt crv cta ctb ctc cte ctk ctr ctt ctv cva cvb cvc cve cvk cvr cvt cvv eaa eab eac eae eak ear eat eav eba ebb ebc ebe ebk ebr ebt ebv ec- eca ecb ecc ece eck ecr ect ecv eea eeb eec eee eek eer eet eev eka ekb ekc eke ekr ekt ekv era erb erc ere erk err ert erv eta etb etc ete etk etr ett etv eva evb evc eve evr evt evv k-t ka- kaa kab kac kae kak kar kat kav kba kbb kbc kbe kbk kbr kca kcb kcc kce kck kcr kct ke- kea keb kec kee kek ker ket kev kkb kkc kke kkk kkr kkt kkv kra krc krk krr krt krv kta ktb ktc kte ktk ktr ktt ktv kva kvb kvk kvr kvv ra- raa rab rac rae rak rar rat rav rba rbb rbc rbe rbk rbr rbt rca rcb rcc rce rcr rct rcv re- rea reb rec ree rek rer ret rev rkb rkc rke rkk rkt rkv rra rrb rrc rrk rrr rrt rta rtb rtc rte rtk rtr rtt rtv rva rvb rvc rve rvr rvt rvv taa tab tac tae tak tar tat tav tba tbb tbc tbe tbk tbr tbt tbv tca tcb tcc tce tck tcr tct tcv te- tea teb tec tee tek ter tet tev tka tkb tkc tke tkk tkr tkt tra trb trc tre trk trr trt trv tta ttb ttc tte ttk ttr ttt ttv tva tvb tvc tve tvk tvr tvt v-a v-e vaa vab vac vae vak var vat vav vba vbc vbk vbr vbv vca vcc vce vcr vct vea veb vec vee vek ver vet vka vkb vkt vra vrb vrc vre vrk vrr vrt vta vtb vtc vte vtk vtr vtt vtv vva vvb vvc vvr vvt vvv

-vac a-ak a-be aaaa aaab aaac aaae aaar aaav aaba aabb aabc aabt aaca aacb aacc aace aack aacr aact aacv aaea aaec aaev aaka aake aara aarc aare aart aata aatc aatk aatt aava abaa abab abac abae abak abar abat abb- abba abbb abbe abbr abbt abca abcb abcc abcr abct abec abee aber abet abra abrc abta abva ac-t acaa acab acac acae acar acat acba acca accc acce acct ace- acea acec acek acer acet acev acke acr- acra acrc acre acrr acrv acta actc acte actt actv acvv aeac aecb aect aeer aeka aer- aera aerc aeta aetc aetr aett aeva akaa akae akar akca akee aker akka akr- akra akre akte aktv arab arac arae arak arar arat arba arbe arc- arca arce arct area arec aree arek aret arev arka arke arr- arra arrc arre arrk arrr arrt arta artc arte artr artv arva arve at-t ataa atab atac atae atak atar atat atca atcc atck atcr atea atec atee ater atka atkt atkv atra atrc atre atrk atta atte attr avab avar avat avcc avce avea avec aver avkt avra avre avva baaa baak baar baat baba babb babe babr bac- baca bacc bace back bact baek baer bak- baka bake bakr bakt bar- bara barb barc bare bark barr bart bata batc bate batt bava bave bbbb bbeb bbet bbrc bcaa bcar bcat bcbc bcca bccc bcec bcer bcet bcra bctc beak bear beat beav beba bebb bebe beca beck beeb beek beer beet beka beke bera berc bere berk berr bert beta betc bete bett betv brab brac brae brak brat brav brca brcb brce brea breb brec bree brek brer bret brev brka brkb brrr brtc btaa btcc btec btek btrc btrt bttb caaa caab caac caat caba cabe cac- caca cacc cace cack cacr caec caer caka cake cara carb carc care cark carr cart cat- cata catb catc cate catt catv cava cave cbac cbar cbat cbbc cbca cbcc cbce cbcr cbct cbea cbec cbee cber cbet cbka cbkr cbre cbrt cbta cbtc cbtv cbva cbvb cbve cbvr ccaa ccab ccac ccar ccat ccba ccbc ccca cccb cccc cccv ccee ccra ccrc ccre ccrt cctb cctc cctt cctv ceac cear ceat ceba cec- ceca cece cect ceeb ceec ceke cer- cera cerc cere cert cet- ceta cete cetv ceva ckac ckat ckbc ckbe ckck ckcv cker ckrc cktb crab crac crar crat crbc crca crcc crce crcr cre- crea creb crec cree cret crkc crrt crtc crtv ctab ctae ctba ctca ctec ctrc ctta ctvt cvac cvar cvca cvcc cver cvet cvra cvrr cvte eaba eaca eacc eaec eara earb eare eart eata eate eave ebac ebba ebbc ebbr ebcc eber ecaa ecac ecar ecat ecbc ecbe ecca eccb eccc ecce ecct ecka ecra ecrc ecrr ecrv ect- ecta ectc ectv eeca eeea eeee eeka eeke eera eerc eeta eetc eete eeva eka- ekab ekeb ekek eker eket ekka ekta erat erba erbb erbe erca ercc erce ereb erec erer eret erev erke erra errc erre erta