-er a-a a-b a-c aaa aab aac aae aak aao aar aav ab- aba abb abc abe abk abo abr abv ac- aca acb acc ace ack aco acr acv aea aeb aec aee aek aeo aer aev aka akb akc ake akk ako akr akv aoa aob aoc aoe aok aoo aor aov ar- ara arb arc are ark aro arr arv av- ava avb avc ave avk avo avr baa bab bac bae bak bao bar bav bba bbb bbc bbe bbk bbo bbr bca bcb bcc bce bck bco bcr bcv be- bea beb bec bee bek beo ber bev bka bkb bkc bke bkk bko bkr bkv boa bob boc boe bok boo bor bov bra brb bre brk bro brr brv bva bvb bvc bve bvk bvo bvr bvv c-- caa cab cac cae cak cao car cav cba cbb cbc cbe cbk cbo cbr cbv cca ccb ccc cce cck cco ccr ccv ce- cea ceb cec cee cek ceo cer cev cka ckb ckc cko co- coa cob coc coe cok coo cor cov cra crb crc cre crk cro crr crv cva cvb cvc cve cvk cvo cvr cvv eaa eab eac eae eak eao ear eav eba ebb ebc ebe ebk ebo ebr ebv ec- eca ecb ecc ece eck eco ecr ecv eea eeb eec eee eek eeo eer eev eka ekb ekc eke eko ekr ekv eo- eoa eob eoc eoe eok eoo eor era erb erc ere erk ero err erv eva evb evc eve evo evr evv ka- kaa kab kac kae kak kao kar kav kba kbb kbc kbe kbk kbo kbr kca kcb kcc kce kck kcr ke- kea keb kec kee kek keo ker kev kkb kkc kke kkk kkr kkv koa kob koc koe kok koo kor kra krc krk kro krr krv kva kvb kvk kvo kvr kvv oaa oab oac oae oak oao oar oav ob- oba obb obc obe obk obo obr obv oc- oca ocb occ ock oco ocr ocv oea oeb oec oee oeo oer oka okb okc oke okk oko okr oo- ooa oob ooc ook ooo oor oov or- ora orb orc ore ork oro orr orv ov- ova ovb ovc ove ovo ovv ra- raa rab rac rae rak rao rar rav rba rbb rbc rbe rbk rbo rbr rca rcb rcc rce rco rcr rcv re- rea reb rec ree rek reo rer rev rkb rkc rke rkk rko rkv roa rob roc roe rok roo ror rov rra rrb rrc rrk rrr rva rvb rvc rve rvo rvr rvv v-a v-e vaa vab vac vae vak vao var vav vba vbc vbk vbo vbr vbv vca vcc vce vco vcr vea veb vec vee vek veo ver vka vkb voa vob voc voe vok voo vor vov vra vrb vrc vre vrk vrr vva vvb vvc vvo vvr vvv

-vac a-ak a-be a-ok aaaa aaab aaac aaae aaar aaav aaba aabb aabc aaca aacb aacc aace aack aaco aacr aacv aaea aaec aaev aaka aake aaoe aaoo aara aarc aare aaro aava abaa abab abac abae abak abar abb- abba abbb abbe abbo abbr abca abcb abcc abcr abec abee aber aboa abob abok aboo abor abov abra abrc abro abva acaa acab acac acae acar acba acca accc acce acco ace- acea acec acek acer acev acke acoa acoe acor acr- acra acrc acre acro acrr acrv acvv aeac aecb aeer aeka aer- aera aerc aero aeva akaa akae akao akar akca akee aker akka akko akok akr- akra akre aoba aoca aoce aora aorb arab arac arae arak arar arba arbe arc- arca arce arco area arec aree arek areo arev arka arke arko aroa arob aroe aroo aror arr- arra arrc arre arrk arro arrr arva arve arvo avab avao avar avcc avce avco avea avec aveo aver avor avra avre avro avva avvo baaa baak baar baba babb babe babo babr bac- baca bacc bace back baco baek baer bak- baka bake bako bakr bar- bara barb barc bare bark baro barr bava bave bbbb bbeb bbrc bcaa bcar bcbc bcca bccc bcec bcer bcor bcra bcvo beak bear beav beba bebb bebe bebo beca beck beeb beek beer beka beke beko beo- beok beor bera berc bere berk bero berr bevo boab boac boak boar boba bobb bobe bobo boca boce bock boco boea boec boee boeo boer boka boke boko boob booc booe book boor bor- bora bore bork boro borr bova bove bovo brab brac brae brak brao brav brca brcb brce brea breb brec bree brek breo brer brev brka brkb broa brob broc broe brok broo bror brrr c-bo caaa caab caac caba cabe cabo cac- caca cacc cace cack caco cacr caec caer caka cake caor cara carb carc care cark caro carr cava cave cavo cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbka cbko cbkr cbre cbva cbvb cbve cbvr ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccv ccee ccob ccoc ccra ccrc ccre ccvo ceac cear ceba cec- ceca cece ceco ceeb ceec ceke ceor cer- cera cerc cere cero ceva cevo ckac ckbc ckbe ckck ckco ckcv cker ckoa ckob ckoc ckoo ckor ckrc ckvo coak coba cobb cobe cobo coca coce cock coco cok- coka coke coko coob cook cor- cora corb corc core cork coro corr cova cove covo crab crac crar crbc crca crcc crce crcr cre- crea creb crec cree creo crkc crob croc croe crok croo cror cvac cvar cvca cvcc cver cvra cvrr eaba eaca eacc eaec eara earb eare earo eave ebac ebba ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ecaa ecac ecao ecar ecbc ecbe ecca eccb eccc ecce ecco ecka ecko eco- ecra ecrc ecrr ecrv eeca eeea eeee eeka eeke eeoc eera eerc eero eeva eka- ekab ekco ekeb ekek eker ekka ekoa eoka eora eore erba erbb erbe erca ercc erce