-ic a-a a-b a-c a-i aaa aab aac aai aak aao aar ab- aba abb abc abi abk abo abr ac- aca acb acc aci ack aco acr ai- aia aib aic aii aik aio air aka akb akc aki akk ako akr aoa aob aoc aoi aok aoo aor ar- ara arb arc ari ark aro arr baa bab bac bai bak bao bar bba bbb bbc bbi bbk bbo bbr bca bcb bcc bci bck bco bcr bi- bia bib bic bii bik bio bir bka bkb bkc bkk bko bkr boa bob boc boi bok boo bor bra brb bri brk bro brr c-- caa cab cac cai cak cao car cba cbb cbc cbi cbk cbo cbr cca ccb ccc cci cck cco ccr ci- cia cib cic cii cik cio cir cka ckb ckc cki cko co- coa cob coc coi cok coo cor cra crb crc cri crk cro crr ia- iaa iab iac iai iao iar iba ibb ibc ibi ibk ibo ibr ica icb icc ici ick ico icr iia iib iic iii iio iir ika ikb ikc iki ikk iko ikr io- ioa iob ioc ioi ioo ior ir- ira irb irc iri irk iro irr ka- kaa kab kac kai kak kao kar kba kbb kbc kbi kbk kbo kbr kca kcb kcc kci kck kcr kia kib kic kii kik kio kir kkb kkc kki kkk kkr koa kob koc koi kok koo kor kra krc kri krk kro krr o-i oaa oab oac oai oak oao oar ob- oba obb obc obi obk obo obr oc- oca ocb occ oci ock oco ocr oia oib oic oii oik oio oir oka okb okc oki okk oko okr oo- ooa oob ooc ooi ook ooo oor or- ora orb orc ori ork oro orr ra- raa rab rac rai rak rao rar rba rbb rbc rbi rbk rbo rbr rca rcb rcc rci rco rcr ria rib ric rii rik rio rir rkb rkc rkk rko roa rob roc roi rok roo ror rra rrb rrc rri rrk rrr

a-ak a-ii a-ok aaaa aaab aaac aaai aaar aaba aabb aabc aabi aaca aacb aacc aaci aack aaco aacr aaib aaic aaii aaka aaoo aara aarc aari aaro abaa abab abac abai abak abar abb- abba abbb abbi abbo abbr abca abcb abcc abci abcr abia abib abic abir aboa abob abok aboo abor abra abrc abri abro acaa acab acac acai acar acba acca accc acci acco aci- acia acic acir acoa acor acr- acra acrc acri acro acrr aiai aiba aibo aica aicc aicr aiia aiib aiic aiir aika aiki aiko aioc aioi aira airi airo akaa akai akao akar akca akia akik akio akir akka akki akko akok akr- akra aoba aoca aoki aora aorb arab arac arai arak arar arba arbi arc- arca arci arco aria arib arii arik ario arka arki arko aroa arob aroi aroo aror arr- arra arrc arri arrk arro arrr ba-i baaa baak baar baba babb babi babo babr bac- baca bacc baci back baco baia baib baic baik baio bair bak- baka baki bako bakr bar- bara barb barc bari bark baro barr bbbb bbci bbrc bcaa bcar bcbc bcca bccc bcci bcia bcor bcra biak biao biar biba bibb bibi bibo bica bicc bici bick bico biko bio- bioc bioi bira birb biri birk biro birr boab boac boai boak boar boba bobb bobi bobo boca bock boco boi- boii boka boki boko boob booc book boor bor- bora bori bork boro borr brab brac brai brak brao brca brcb bria bric brik brio brka brkb broa brob broc brok broo bror brrr c-bo caaa caab caac caba cabi cabo cac- caca cacc caci cack caco cacr caia caib caic caik caio cair caka caoi caor cara carb carc cari cark caro carr cbac cbar cbbc cbca cbcc cbcr cbia cbir cbka cbko cbkr ccaa ccab ccac ccai ccar ccba ccbc ccca cccb cccc ccci ccic ccii ccir ccob ccoc ccra ccrc ccri ciaa ciak ciao ciar ciba cibc cibi cibo cica cicc cici cico cicr ciia ciii cika ciko cikr ciob cior cira cirb circ ciri cirk ciro cirr ckac ckbc ckbi ckck ckco ckoa ckob ckoc ckoi ckoo ckor ckrc coai coak coba cobb cobi cobo coca cock coco coia coir cok- coka coko coob cook cor- cora corb corc cori cork coro corr crab crac crai crar crbc crca crcc crcr cria crib cric crik crkc crob croc crok croo cror iaaa iaac iaai iaba iaca iacc iacr iaia iara iarc ibac ibar ibca ibia ibra ibrc ibri ibro icaa icab icac icai icao icar icbc icca iccb iccc icci icco iccr icoc icor icra icrc icrr iiac iica iiii iiio iioi iioo iira iirc ikar ikki ikko ikoo ikra ikri ioba iobi ioci ioii ioio ioko iooi iooo iora iori irac irai irak irao irar irca ircc iri- iria iric irio irka irki irob iroc irra irrc irri k-ci kaaa kaab kaai kaak kaar kaba kabb kabc kabi kabo kabr kacb kacc kaci kaco kaia kaib kaic kaii kaik kaio kair kaka kakc kaki kakk kako kaoa kaoc kaoi kaok kaor kara karb kari kark karo karr kbaa kbab kbac kbai kbak kbar kbba kbbb kbbc kbbi kbbk kbbo kbbr kbca kbcb kbci kbck kbco kbcr kbia kbib kbic kbik kbio kbkb kbkk kbko kbkr kboa kbob kboc kboi kbok kboo kbra kbrb kbrc kbri kbrk kbro kcaa kcab kcac kcai kcar kcba kcbc kcbi kcbk kcbr kcca kccb kccc kcci kcck kccr kcic kcii kcir kckc kckk kcko kckr kcob kcor kcrc kcri kcro kcrr kiab kiac kiai kiar kiba kibb kibc kibi kibo kibr kica kicb kicc kick kicr kiia kiic kiii kiik kika kikc kiki kikk kiko kikr kioa kioc kioi kiok kioo kira kirb kirc kiri kirk kiro kirr kkaa kkac kkai kkar kkba kkbb kkbi kkbo kkbr kkcb kkci kkck kkco kkcr kkia kkic kkik kkkk kkoa kkob kkoo kkor