a-a a-b a-c aaa aab aac aak aao aar aau aav ab- aba abb abc abk abo abr abu abv ac- aca acb acc ack aco acr acu acv aka akb akc akk ako akr aku akv aoa aob aoc aok aoo aor aou aov ar- ara arb arc ark aro arr aru arv au- aua aub auc auk auo aur auv av- ava avb avc avk avo avr avu b-u baa bab bac bak bao bar bau bav bba bbb bbc bbk bbo bbr bbu bca bcb bcc bck bco bcr bcu bcv bka bkb bkc bkk bko bkr bkv boa bob boc bok boo bor bou bov bra brb brk bro brr bru brv bua bub buc buk buo bur buu bva bvb bvc bvk bvo bvr bvu bvv c-- caa cab cac cak cao car cau cav cba cbb cbc cbk cbo cbr cbu cbv cca ccb ccc cck cco ccr ccu ccv cka ckb ckc cko co- coa cob coc cok coo cor cou cov cra crb crc crk cro crr cru crv cua cub cuc cuk cuo cur cuu cuv cva cvb cvc cvk cvo cvr cvu cvv ka- kaa kab kac kak kao kar kau kav kba kbb kbc kbk kbo kbr kbu kca kcb kcc kck kcr kcu kkb kkc kkk kkr kku kkv koa kob koc kok koo kor kou kra krc krk kro krr kru krv kub kuc kuk kur kuu kva kvb kvk kvo kvr kvv oaa oab oac oak oao oar oau oav ob- oba obb obc obk obo obr obu obv oc- oca ocb occ ock oco ocr ocu ocv oka okb okc okk oko okr oku oo- ooa oob ooc ook ooo oor oov or- ora orb orc ork oro orr oru orv ou- oua ouc ouk ouo our ov- ova ovb ovc ovo ovv ra- raa rab rac rak rao rar rau rav rba rbb rbc rbk rbo rbr rbu rca rcb rcc rco rcr rcu rcv rkb rkc rkk rko rku rkv roa rob roc rok roo ror rou rov rra rrb rrc rrk rrr rru rua rub ruc ruk ruo rur ruu ruv rva rvb rvc rvo rvr rvu rvv ua- uaa uab uac uak uao uar uau uav uba ubb ubc ubk ubo ubr ubu ubv uca ucb ucc uck uco ucr ucu ucv uka ukb ukc ukk ukr uku uoa uob uoc uok uoo uor ur- ura urb urc urk uro urr uru uua uuc uur uuu uva uvb uvc uvo uvu uvv v-a vaa vab vac vak vao var vau vav vba vbc vbk vbo vbr vbv vca vcc vco vcr vcu vka vkb voa vob voc vok voo vor vou vov vra vrb vrc vrk vrr vru vuk vur vuv vva vvb vvc vvo vvr vvv

-vac a-ak a-ok aaaa aaab aaac aaar aaav aaba aabb aabc aaca aacb aacc aack aaco aacr aacu aacv aaka aaku aaoo aara aarc aaro aaru aava abaa abab abac abak abar abau abb- abba abbb abbo abbr abca abcb abcc abcr aboa abob abok aboo abor abou abov abra abrc abro abua abuk abva acaa acab acac acar acba acca accc acco accu acoa acor acou acr- acra acrc acro acrr acrv acu- acuo acur acvv akaa akao akar akca akka akko akku akok akr- akra akua aoba aoca aora aorb arab arac arak arar arau arba arc- arca arco arka arko aroa arob aroo aror arr- arra arrc arrk arro arrr arru arua arub arva arvo auaa auca aur- aura auro avab avao avar avcc avco avor avou avra avro avur avva avvo baaa baak baar baba babb babo babr babu bac- baca bacc back baco bak- baka bako bakr baku bar- bara barb barc bark baro barr baru bau- bauk baur bava bavu bbau bbbb bbrc bcaa bcar bcbc bcca bccc bcor bcra bcru bcuc bcvo boab boac boak boar boba bobb bobo bobu boca bock boco bocu boka boko boku boob booc book boor bor- bora bork boro borr boru boua bouk bour bova bovo brab brac brak brao brau brav brca brcb brka brkb broa brob broc brok broo bror brou brrr bruc bruv buar buba bubb bubo bubu buca bucc buck buco bucu buka bukk buko buku bur- bura burb burk buro burr buru c-bo caaa caab caac caba cabo cabu cac- caca cacc cack caco cacr caka caor cara carb carc cark caro carr cauc cauk cauo cava cavo cavu cbac cbar cbbc cbca cbcc cbcr cbcu cbka cbko cbkr cbva cbvb cbvr ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu cccv ccob ccoc ccra ccrc ccuc ccvo ckac ckbc ckck ckco ckcv ckoa ckob ckoc ckoo ckor ckrc ckvo coak coba cobb cobo cobu coca cock coco cocu cok- coka coko coob cook cor- cora corb corc cork coro corr coua coub couk cour cova covo crab crac crar crau crbc crbu crca crcc crcr crkc crob croc crok croo cror crub cruk cuau cub- cuba cubb cuca cucc cuck cuk- cuka cura curb curo curr cvac cvar cvca cvcc cvra cvrr kaaa kaab kaak kaar kaba kabb kabc kabo kabr kabu kacb kacc kaco kacu kacv kaka kakc kakk kako kaku kaoa kaoc kaok kaor kara karb kark karo karr karu karv kau- kaub kauc kauk kauo kaur kava kavb kavo kavu kavv kbaa kbab kbac kbak kbar kbba kbbb kbbc kbbk kbbo kbbr kbbu kbca kbcb kbck kbco kbcr kbcu kbkb kbkk kbko kbkr kbkv kboa kbob kboc kbok kboo kbov kbra kbrb kbrc kbrk kbro kbru kbrv kbua kbub kbuc kbuk kbur kbuu kbva kbvb kbvc kbvo kbvr kbvu kcaa kcab kcac kcar kcau kcav kcba kcbc kcbk kcbr kcbu kcca kccb kccc kcck kccr kccu kccv kckc kckk kcko kckr kckv kcob kcor kcou kcrc kcro kcrr kcru kcrv kcua kcub kcuk kcvk kcvo kcvr kcvu kcvv kkaa kkac kkar kkba kkbb kkbo kkbr kkcb kkck kkco kkcr kkkk kkoa kkob kkoo kkor kkov kkrb kkrc kkrk kkro kkrr kkrv