-er -ic a-a a-b a-c a-i aaa aab aac aae aai aak aar ab- aba abb abc abe abi abk abr ac- aca acb acc ace aci ack acr aea aeb aec aee aei aek aer ai- aia aib aic aie aii aik air aka akb akc ake aki akk akr ar- ara arb arc are ari ark arr baa bab bac bae bai bak bar bba bbb bbc bbe bbi bbk bbr bca bcb bcc bce bci bck bcr be- bea beb bec bee bei bek ber bi- bia bib bic bie bii bik bir bka bkb bkc bke bkk bkr bra brb bre bri brk brr c-- caa cab cac cae cai cak car cba cbb cbc cbe cbi cbk cbr cca ccb ccc cce cci cck ccr ce- cea ceb cec cee cei cek cer ci- cia cib cic cie cii cik cir cka ckb ckc cki cra crb crc cre cri crk crr eaa eab eac eae eai eak ear eba ebb ebc ebe ebi ebk ebr ec- eca ecb ecc ece eci eck ecr eea eeb eec eee eek eer eia eib eic eie eii eik eir eka ekb ekc eke eki ekr era erb erc ere eri erk err ia- iaa iab iac iae iai iar iba ibb ibc ibe ibi ibk ibr ica icb icc ice ici ick icr ie- iea iec iee iei iek ier iia iib iic iie iii iir ika ikb ikc ike iki ikk ikr ir- ira irb irc ire iri irk irr ka- kaa kab kac kae kai kak kar kba kbb kbc kbe kbi kbk kbr kca kcb kcc kce kci kck kcr ke- kea keb kec kee kei kek ker kia kib kic kie kii kik kir kkb kkc kke kki kkk kkr kra krc kri krk krr ra- raa rab rac rae rai rak rar rba rbb rbc rbe rbi rbk rbr rca rcb rcc rce rci rcr re- rea reb rec ree rei rek rer ria rib ric rie rii rik rir rkb rkc rke rkk rra rrb rrc rri rrk rrr

a-ak a-be a-ii aaaa aaab aaac aaae aaai aaar aaba aabb aabc aabi aaca aacb aacc aace aaci aack aacr aaea aaec aaib aaic aaii aaka aake aara aarc aare aari abaa abab abac abae abai abak abar abb- abba abbb abbe abbi abbr abca abcb abcc abci abcr abec abee aber abia abib abic abie abir abra abrc abri acaa acab acac acae acai acar acba acca accc acce acci ace- acea acec acek acer aci- acia acic acie acir acke acr- acra acrc acre acri acrr aeac aebi aecb aeci aeer aeka aer- aera aerc aeri aiai aiba aica aicc aice aicr aiea aiee aiia aiib aiic aiir aika aike aiki aira aire airi akaa akae akai akar akca akee aker akia akie akik akir akka akki akr- akra akre arab arac arae arai arak arar arba arbe arbi arc- arca arce arci area arec aree arei arek aria arib arie arii arik arka arke arki arr- arra arrc arre arri arrk arrr ba-i baaa baak baar baba babb babe babi babr bac- baca bacc bace baci back baek baer baia baib baic baie baik bair bak- baka bake baki bakr bar- bara barb barc bare bari bark barr bbbb bbci bbeb bbrc bcaa bcar bcbc bcca bccc bcci bcec bcer bcia bcie bcra beak bear beba bebb bebe bebi beca beci beck beeb beek beer beia beic beik beir beka beke beki bera berc bere beri berk berr biak biar biba bibb bibe bibi bica bicc bice bici bick bieb bier bike bira birb bire biri birk birr brab brac brae brai brak brca brcb brce brea breb brec bree brei brek brer bria bric brie brik brka brkb brrr caaa caab caac caba cabe cabi cac- caca cacc cace caci cack cacr caec caei caer caia caib caic caik cair caka cake cara carb carc care cari cark carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbia cbir cbka cbkr cbre ccaa ccab ccac ccai ccar ccba ccbc ccca cccb cccc ccci ccee ccic ccii ccir ccra ccrc ccre ccri ceac cear ceba cec- ceca cece ceci ceeb ceec ceke cer- cera cerc cere ceri ciaa ciak ciar ciba cibc cibe cibi cica cicc cici cicr ciee cier ciia ciii cika cikr cira cirb circ cire ciri cirk cirr ckac ckbc ckbe ckbi ckck cker ckrc crab crac crai crar crbc crca crcc crce crcr cre- crea creb crec cree crei cria crib cric crie crik crkc eaba eaca eacc eaec eara earb eare ebac ebba ebbc ebbr ebcc eber ebic ecaa ecac ecai ecar ecbc ecbe ecca eccb eccc ecce ecci ecib ecka ecra ecrc ecri ecrr eeca eeea eeee eeka eeke eera eerc eica eick eiec eiei eier eika eike eiki eira eire eka- ekab ekeb ekek eker ekka ekki erba erbb erbe erca ercc erce ereb erec erei erer eria eric erie erik erke erki erra errc erre i-be iaaa iaac iaai iaba iaca iacc iacr iaea iaec iaia iara iarc iare ibac ibar ibca ibea ibec ibia ibie ibra ibrc ibri icaa icab icac icai icar icbc icca iccb iccc icci iccr icea icec icee icer icke icra icrc icre icrr ieac iecc ieie iera iere ieri iiac iica iiie iiii iira iirc ikar ikea ikee iker ikki ikra ikri irac irae irai irak irar irbe irca ircc iree irer iri- iria iric irie irka irki irra irrc irre irri k-ci kaaa kaab kaai kaak kaar kaba kabb kabc kabe kabi kabr kacb kacc kace kaci kaei kaer kaia kaib kaic kaie kaii kaik kair kaka kakc kake kaki kakk kara karb kare kari kark karr kbaa kbab kbac kbae kbai kbak kbar kbba kbbb kbbc kbbe kbbi kbbk kbbr kbca kbcb kbce kbci kbck kbcr kbeb kbec kbee kbek kber kbia kbib kbic kbie kbik kbkb kbkk kbkr kbra kbrb kbrc kbre kbri kbrk kcaa kcab kcac kcai kcar