a-a a-b a-c aaa aab aac aad aak aao aar aau ab- aba abb abc abd abk abo abr abu ac- aca acb acc acd ack aco acr acu ad- ada adb adc add adk ado adr adu aka akb akc akd akk ako akr aku aoa aob aoc aod aok aoo aor aou ar- ara arb arc ard ark aro arr aru au- aua aub auc aud auk auo aur b-u baa bab bac bad bak bao bar bau bba bbb bbc bbd bbk bbo bbr bbu bca bcb bcc bcd bck bco bcr bcu bda bdb bdc bdd bdk bdo bdr bdu bka bkb bkc bkk bko bkr boa bob boc bod bok boo bor bou bra brb brd brk bro brr bru bua bub buc bud buk buo bur buu c-- caa cab cac cad cak cao car cau cba cbb cbc cbd cbk cbo cbr cbu cca ccb ccc ccd cck cco ccr ccu cda cdb cdc cdd cdk cdo cdr cdu cka ckb ckc ckd cko co- coa cob coc cod cok coo cor cou cra crb crc crd crk cro crr cru cua cub cuc cud cuk cuo cur cuu daa dab dac dad dak dao dar dau dba dbb dbc dbd dbk dbo dbr dbu dca dcb dcc dcd dck dco dcr dcu dda ddb ddc ddd ddk ddo ddr ddu dka dkb dkc dkk dko dkr dku doa dob doc dod dok doo dor dou dra drb drc drd drk dro drr dru dua dub duc dud duk duo dur ka- kaa kab kac kad kak kao kar kau kba kbb kbc kbd kbk kbo kbr kbu kca kcb kcc kcd kck kcr kcu kda kdb kdc kdk kdo kdr kdu kkb kkc kkk kkr kku koa kob koc kod kok koo kor kou kra krc krd krk kro krr kru kub kuc kud kuk kur kuu oaa oab oac oad oak oao oar oau ob- oba obb obc obd obk obo obr obu oc- oca ocb occ ocd ock oco ocr ocu oda odb odc odd odo odr odu oka okb okc okd okk oko okr oku oo- ooa oob ooc ood ook ooo oor or- ora orb orc ord ork oro orr oru ou- oua ouc oud ouk ouo our ra- raa rab rac rad rak rao rar rau rba rbb rbc rbd rbk rbo rbr rbu rca rcb rcc rcd rco rcr rcu rda rdb rdc rdd rdo rdr rdu rkb rkc rkk rko rku roa rob roc rod rok roo ror rou rra rrb rrc rrd rrk rrr rru rua rub ruc rud ruk ruo rur ruu ua- uaa uab uac uad uak uao uar uau uba ubb ubc ubk ubo ubr ubu uca ucb ucc ucd uck uco ucr ucu uda udb udc udd udk udo udr udu uka ukb ukc ukk ukr uku uoa uob uoc uod uok uoo uor ur- ura urb urc urd urk uro urr uru uua uuc uur uuu

a-ak a-do a-ok aaaa aaab aaac aaad aaar aaba aabb aabc aabd aaca aacb aacc aacd aack aaco aacr aacu aada aadc aadu aaka aaku aaoo aara aarc aard aaro aaru abaa abab abac abad abak abar abau abb- abba abbb abbo abbr abca abcb abcc abcd abcr abda abdo abdu aboa abob abod abok aboo abor abou abra abrc abro abua abud abuk acaa acab acac acad acar acba acca accc accd acco accu acda acdb acdc ackd acoa acod acor acou acr- acra acrc acro acrr acu- acuo acur adaa adab adac adad adak adao adar adba adbc adcc adda addc addd addo addr addu adob adoc adod adok adoo ador adra adro adua adub aduk adur akaa akao akar akca akka akko akku akok akr- akra akua aoba aoca aora aorb arab arac arad arak arar arau arba arc- arca arco arda ardc ardo ardu arka arko aroa arob arod aroo aror arr- arra arrc arrk arro arrr arru arua arub arud auaa auca audc audo aur- aura aurd auro baaa baad baak baar baba babb babo babr babu bac- baca bacc back baco bada badb badd bado badr badu bak- baka bako bakr baku bar- bara barb barc bard bark baro barr baru bau- baud bauk baur bbad bbau bbbb bbdd bbdo bbrc bcaa bcar bcbc bcca bccc bcda bcor bcra bcru bcuc bd-r bdbc bddc boab boac boad boak boar boba bobb bobo bobu boca bock boco bocu boda bodb bodo bodu boka boko boku boob booc bood book boor bor- bora bord bork boro borr boru boua boud bouk bour brab brac brad brak brao brau brca brcb brda brdo brka brkb broa brob broc brod brok broo bror brou brrr bruc brud buad buar buba bubb bubo bubu buca bucc buck buco bucu buda budb budd budo budu buka bukk buko buku bur- bura burb burd burk buro burr buru c-bo c-cd caaa caab caac caba cabo cabu cac- caca cacc cack caco cacr cada cadc cadd cado cadr cadu caka caod caor cara carb carc card cark caro carr cauc cauk cauo cbac cbar cbbc cbca cbcc cbcr cbcu cbdb cbdc cbdo cbka cbko cbkr cbrd ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc cccu ccdc ccdr ccob ccoc ccod ccra ccrc ccuc cd-r cdaa cdac cdad cdba cdda cddb cddr ckac ckbc ckck ckco ckdo ckdu ckoa ckob ckoc ckoo ckor ckrc ckrd coad coak coba cobb cobo cobu coca cock coco cocu coda codd cok- coka coko coob cood cook cor- cora corb corc cord cork coro corr coua coub coud couk cour crab crac crar crau crbc crbu crca crcc crcr crda crdc crkc crob croc crod crok croo cror crub crud cruk cuau cub- cuba cubb cuca cucc cuck cuda cuk- cuka cura curb curd curo curr d-bo daab daad daar daau daba dabb dabo dabu daca dada dado dadu daka dako daku daou dara darb darc dard dark daro darr daru daub daud dauk daur dbar dbcc dcbc