-er -ic a-a a-b a-c a-i aaa aab aac aae aaf aai aak aar ab- aba abb abc abe abf abi abk abr ac- aca acb acc ace acf aci ack acr aea aeb aec aee aef aei aek aer af- afa afb afc afe aff afi afk afr ai- aia aib aic aie aif aii aik air aka akb akc ake aki akk akr ar- ara arb arc are arf ari ark arr baa bab bac bae baf bai bak bar bba bbb bbc bbe bbf bbi bbk bbr bca bcb bcc bce bcf bci bck bcr be- bea beb bec bee bef bei bek ber bfa bfb bfc bfe bff bfi bfr bi- bia bib bic bie bif bii bik bir bka bkb bkc bke bkf bkk bkr bra brb bre brf bri brk brr c-- caa cab cac cae caf cai cak car cba cbb cbc cbe cbf cbi cbk cbr cca ccb ccc cce ccf cci cck ccr ce- cea ceb cec cee cef cei cek cer cfa cfb cfc cfe cff cfi cfk cfr ci- cia cib cic cie cif cii cik cir cka ckb ckc cki cra crb crc cre crf cri crk crr eaa eab eac eae eaf eai eak ear eba ebb ebc ebe ebf ebi ebk ebr ec- eca ecb ecc ece ecf eci eck ecr eea eeb eec eee eef eek eer ef- efa efb efc efe eff efi efr eia eib eic eie eif eii eik eir eka ekb ekc eke ekf eki ekr era erb erc ere erf eri erk err faa fab fac fae faf fai fak far fba fbb fbc fbe fbf fbi fbk fbr fca fcb fcc fce fcf fci fck fcr fea feb fec fee fef fei fek fer ffa ffc ffe fff ffi ffk ffr fia fib fic fie fif fii fik fir fka fkb fkc fkf fki fkk fra frb frc fre frf fri frk frr i-f ia- iaa iab iac iae iaf iai iar iba ibb ibc ibe ibf ibi ibk ibr ica icb icc ice icf ici ick icr ie- iea iec iee ief iei iek ier ifa ifb ifc ife iff ifi ifr iia iib iic iie iif iii iir ika ikb ikc ike ikf iki ikk ikr ir- ira irb irc ire irf iri irk irr ka- kaa kab kac kae kaf kai kak kar kba kbb kbc kbe kbf kbi kbk kbr kca kcb kcc kce kci kck kcr ke- kea keb kec kee kef kei kek ker kfa kfc kff kfi kia kib kic kie kif kii kik kir kkb kkc kke kki kkk kkr kra krc krf kri krk krr ra- raa rab rac rae raf rai rak rar rba rbb rbc rbe rbf rbi rbk rbr rca rcb rcc rce rcf rci rcr re- rea reb rec ree ref rei rek rer rfa rfb rfc rfe rff rfi rfk rfr ria rib ric rie rif rii rik rir rkb rkc rke rkf rkk rra rrb rrc rrf rri rrk rrr

a-ak a-be a-ii aaaa aaab aaac aaae aaaf aaai aaar aaba aabb aabc aabi aaca aacb aacc aace aacf aaci aack aacr aaea aaec aafa aafb aafc aaff aafi aaib aaic aaii aaka aake aara aarc aare aari abaa abab abac abae abaf abai abak abar abb- abba abbb abbe abbi abbr abca abcb abcc abcf abci abcr abec abee aber abff abia abib abic abie abir abra abrc abri acaa acab acac acae acai acar acba acca accc acce accf acci ace- acea acec acek acer acfc acfe acfi aci- acia acic acie acif acir acke acr- acra acrc acre acri acrr aeac aeaf aebi aecb aeci aeer aeka aer- aera aerc aeri afaa afak afar afca afcb afcc afci afee afek afer affa affc affi afia afib afif afik afir afka afkr afr- afra afrc afre afri aiai aiba aica aicc aice aicf aicr aiea aiee aiff aiia aiib aiic aiir aika aike aiki aira aire airi akaa akae akai akar akca akee aker akia akie akif akik akir akka akki akr- akra akre arab arac arae araf arai arak arar arba arbe arbi arc- arca arce arci area arec aree aref arei arek arfa arfb arfc arff aria arib arie arif arii arik arka arke arki arr- arra arrc arre arri arrk arrr ba-i baaa baaf baak baar baba babb babe babi babr bac- baca bacc bace baci back baek baer bafc baff baia baib baic baie baik bair bak- baka bake baki bakr bar- bara barb barc bare barf bari bark barr bbbb bbci bbeb bbfc bbrc bcaa bcar bcbc bcca bccc bcci bcec bcer bcfc bcia bcie bcra beaf beak bear beba bebb bebe bebi beca beci beck beeb beef beek beer befa befe beff beia beic beik beir beka beke beki bera berc bere beri berk berr bfca biaf biak biar biba bibb bibe bibi bica bicc bice bici bick bieb bief bier bifa biff bifi bike bira birb bire biri birk birr brab brac brae braf brai brak brca brcb brce brea breb brec bree bref brei brek brer brfc bria bric brie brik brka brkb brrr caaa caab caac caaf caba cabe cabf cabi cac- caca cacc cace caci cack cacr caec caei caer cafa cafb cafc cafe caff caia caib caic caik cair caka cake cara carb carc care carf cari cark carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cbef cber cbfb cbfc cbia cbir cbka cbkr cbre ccaa ccab ccac ccaf ccai ccar ccba ccbc ccca cccb cccc cccf ccci ccee ccfa ccfc ccff ccfi ccic ccii ccir ccra ccrc ccre ccrf ccri ceac cear ceba cec- ceca cece ceci ceeb ceec cef- cefa cefc ceke cer- cera cerc cere cerf ceri cfaa cfab cfac cfae cfar cfbc cfbr cfca cfcb cfcf cffb cffr cfia cfra cfrb cfre ciaa ciak ciar ciba cibc cibe cibi cica cicc cici cicr ciee cier cifa cife ciff ciia ciii cika cikr cira cirb