-er a-a a-b a-c aaa aab aac aae aak aam aao aar ab- aba abb abc abe abk abm abo abr ac- aca acb acc ace ack acm aco acr aea aeb aec aee aek aem aeo aer aka akb akc ake akk akm ako akr ama amb amc ame amk amm amo amr aoa aob aoc aoe aok aom aoo aor ar- ara arb arc are ark arm aro arr baa bab bac bae bak bam bao bar bba bbb bbc bbe bbk bbm bbo bbr bca bcb bcc bce bck bcm bco bcr be- bea beb bec bee bek bem beo ber bka bkb bkc bke bkk bkm bko bkr bma bmb bmc bme bmk bmm bmo bmr boa bob boc boe bok bom boo bor bra brb bre brk brm bro brr c-- caa cab cac cae cak cam cao car cba cbb cbc cbe cbk cbm cbo cbr cca ccb ccc cce cck ccm cco ccr ce- cea ceb cec cee cek cem ceo cer cka ckb ckc ckm cko cma cmb cmc cme cmk cmm cmo cmr co- coa cob coc coe cok com coo cor cra crb crc cre crk crm cro crr eaa eab eac eae eak eam eao ear eba ebb ebc ebe ebk ebm ebo ebr ec- eca ecb ecc ece eck ecm eco ecr eea eeb eec eee eek eem eeo eer eka ekb ekc eke eko ekr em- ema emb emc eme emk emm emo emr eo- eoa eob eoc eoe eok eom eoo eor era erb erc ere erk erm ero err ka- kaa kab kac kae kak kam kao kar kba kbb kbc kbe kbk kbm kbo kbr kca kcb kcc kce kck kcm kcr ke- kea keb kec kee kek kem keo ker kkb kkc kke kkk kkm kkr kma kmb kmc kme kmk kmm kmo koa kob koc koe kok kom koo kor kra krc krk kro krr m-o m-r maa mab mac mae mak mam mao mar mba mbb mbc mbe mbk mbm mbo mbr mc- mca mcb mcc mce mck mcm mco mcr mea meb mec mee mek mem meo mer mka mkb mkc mke mkk mkm mko mkr mma mmb mmc mme mmk mmm mmo mmr moa mob moc moe mok mom moo mor mra mrb mrc mre mrk mrm mro mrr oaa oab oac oae oak oam oao oar ob- oba obb obc obe obk obm obo obr oc- oca ocb occ ock ocm oco ocr oea oeb oec oee oem oeo oer oka okb okc oke okk oko okr om- oma omb omc ome omm omo omr oo- ooa oob ooc ook oom ooo oor or- ora orb orc ore ork orm oro orr ra- raa rab rac rae rak ram rao rar rba rbb rbc rbe rbk rbm rbo rbr rca rcb rcc rce rcm rco rcr re- rea reb rec ree rek rem reo rer rkb rkc rke rkk rkm rko rma rmb rmc rme rmm rmo rmr roa rob roc roe rok rom roo ror rra rrb rrc rrk rrm rrr

a-ak a-be a-ok aaaa aaab aaac aaae aaam aaar aaba aabb aabc aabm aaca aacb aacc aace aack aacm aaco aacr aaea aaec aaem aaka aake aama aamb aamc aame aamo aamr aaoe aaoo aara aarc aare aarm aaro abaa abab abac abae abak abam abar abb- abba abbb abbe abbo abbr abca abcb abcc abcr abec abee aber abma abmb abmc aboa abob abok aboo abor abra abrc abro acaa acab acac acae acar acba acca accc acce accm acco ace- acea acec acek acem acer acke acma acmc acme acoa acoe acom acor acr- acra acrc acre acrm acro acrr aeac aecb aeer aeka aeom aer- aera aerc aero akaa akae akam akao akar akca akee aker akka akko akok akom akr- akra akre amaa amac amae amam amar amb- amba ambe ambo ambr amca amcc amco amec amee amer amka amm- amma amme ammo amob amoc amok amoo amor amra amrc amro aoba aoca aoce aoma aora aorb arab arac arae arak aram arar arba arbe arc- arca arce arcm arco area arec aree arek arem areo arka arke arko arma armc arme armm armo aroa arob aroe arom aroo aror arr- arra arrc arre arrk arro arrr baaa baak baam baar baba babb babe babm babo babr bac- baca bacc bace back baco baek baer bak- baka bake bako bakr bama bamb bamc bame bamm bar- bara barb barc bare bark barm baro barr bbbb bbcm bbeb bbrc bcaa bcam bcar bcbc bcca bccc bccm bcec bcer bcma bcor bcra beak beam bear beba bebb bebe bebo beca beck beeb beek beem beer beka beke beko bema beme beo- beok beor bera berc bere berk berm bero berr bmaa bmce bmoc boab boac boak boar boba bobb bobe bobo boca boce bock bocm boco boea boec boee boeo boer boka boke boko boma bomb bome boob booc booe book boom boor bor- bora bore bork borm boro borr brab brac brae brak bram brao brca brcb brce brea breb brec bree brek brem breo brer brka brkb brmc broa brob broc broe brok brom broo bror brrm brrr c-bo caaa caab caac caam caba cabe cabo cac- caca cacc cace cack cacm caco cacr caec caem caer caka cake cama camb camc came camk camm camo caor cara carb carc care cark carm caro carr cbac cbar cbbc cbca cbcc cbce cbcm cbcr cbea cbec cbee cber cbka cbkm cbko cbkr cbme cbre cbrm ccaa ccab ccac ccam ccar ccba ccbc ccca cccb cccc cccm ccee cckm ccma ccmb ccmc ccmm ccob ccoc ccom ccra ccrc ccre ceac cear ceba cec- ceca cece cecm ceco ceeb ceec ceem ceke cema cemb ceme cemm cemr ceor cer- cera cerc cere cero ckac ckbc ckbe ckck ckcm ckco ckem cker ckmo ckoa ckob ckoc ckom ckoo ckor ckrc ckrm cmaa cmac cmba cmbc cmcc cmea cmec cmmb cmmc cmoc cmra cmrr coak coba cobb