-er -ic a-a a-b a-c a-i aaa aab aac aae aai aao aar ab- aba abb abc abe abi abo abr ac- aca acb acc ace aci aco acr aea aeb aec aee aei aeo aer ai- aia aib aic aie aii aio air aoa aob aoc aoe aoi aoo aor ar- ara arb arc are ari aro arr baa bab bac bae bai bao bar bba bbb bbc bbe bbi bbo bbr bca bcb bcc bce bci bco bcr be- bea beb bec bee bei beo ber bi- bia bib bic bie bii bio bir boa bob boc boe boi boo bor bra brb bre bri bro brr c-- caa cab cac cae cai cao car cba cbb cbc cbe cbi cbo cbr cca ccb ccc cce cci cco ccr ce- cea ceb cec cee cei ceo cer ci- cia cib cic cie cii cio cir co- coa cob coc coe coi coo cor cra crb crc cre cri cro crr eaa eab eac eae eai eao ear eba ebb ebc ebe ebi ebo ebr ec- eca ecb ecc ece eci eco ecr eea eeb eec eee eeo eer eia eib eic eie eii eio eir eo- eoa eob eoc eoe eoi eoo eor era erb erc ere eri ero err ia- iaa iab iac iae iai iao iar iba ibb ibc ibe ibi ibo ibr ica icb icc ice ici ico icr ie- iea iec iee iei ier iia iib iic iie iii iio iir io- ioa iob ioc ioe ioi ioo ior ir- ira irb irc ire iri iro irr o-i oaa oab oac oae oai oao oar ob- oba obb obc obe obi obo obr oc- oca ocb occ oci oco ocr oea oeb oec oee oei oeo oer oia oib oic oie oii oio oir oo- ooa oob ooc ooi ooo oor or- ora orb orc ore ori oro orr ra- raa rab rac rae rai rao rar rba rbb rbc rbe rbi rbo rbr rca rcb rcc rce rci rco rcr re- rea reb rec ree rei reo rer ria rib ric rie rii rio rir roa rob roc roe roi roo ror rra rrb rrc rri rrr

a-be a-ii aaaa aaab aaac aaae aaai aaar aaba aabb aabc aabi aaca aacb aacc aace aaci aaco aacr aaea aaec aaib aaic aaii aaoe aaoo aara aarc aare aari aaro abaa abab abac abae abai abar abb- abba abbb abbe abbi abbo abbr abca abcb abcc abci abcr abec abee aber abia abib abic abie abir aboa abob aboo abor abra abrc abri abro acaa acab acac acae acai acar acba acca accc acce acci acco ace- acea acec acer aci- acia acic acie acir acoa acoe acor acr- acra acrc acre acri acro acrr aeac aebi aecb aeci aeer aeio aer- aera aerc aeri aero aiai aiba aibo aica aicc aice aicr aiea aiee aiia aiib aiic aiir aioc aioi aira aire airi airo aoba aoca aoce aora aorb arab arac arae arai arar arba arbe arbi arc- arca arce arci arco area arec aree arei areo aria arib arie arii ario aroa arob aroe aroi aroo aror arr- arra arrc arre arri arro arrr ba-i baaa baar baba babb babe babi babo babr bac- baca bacc bace baci baco baer baia baib baic baie baio bair bar- bara barb barc bare bari baro barr bbbb bbci bbeb bbrc bcaa bcar bcbc bcca bccc bcci bcec bcer bcia bcie bcor bcra bear beba bebb bebe bebi bebo beca beci beeb beer beia beic beir beo- beor bera berc bere beri bero berr biao biar biba bibb bibe bibi bibo bica bicc bice bici bico bieb bier bio- bioc bioi bira birb bire biri biro birr boab boac boai boar boba bobb bobe bobi bobo boca boce boco boea boec boee boeo boer boi- boie boii boob booc booe boor bor- bora bore bori boro borr brab brac brae brai brao brca brcb brce brea breb brec bree brei breo brer bria bric brie brio broa brob broc broe broo bror brrr c-bo caaa caab caac caba cabe cabi cabo cac- caca cacc cace caci caco cacr caec caei caer caia caib caic caio cair caoi caor cara carb carc care cari caro carr cbac cbar cbbc cbca cbcc cbce cbcr cbea cbec cbee cber cbia cbir cbre ccaa ccab ccac ccai ccar ccba ccbc ccca cccb cccc ccci ccee ccic ccii ccir ccob ccoc ccra ccrc ccre ccri ceac cear ceba cec- ceca cece ceci ceco ceeb ceec ceor cer- cera cerc cere ceri cero ciaa ciao ciar ciba cibc cibe cibi cibo cica cicc cici cico cicr ciee cier ciia ciii ciob cior cira cirb circ cire ciri ciro cirr coai coba cobb cobe cobi cobo coca coce coco coia coir coob cor- cora corb corc core cori coro corr crab crac crai crar crbc crca crcc crce crcr cre- crea creb crec cree crei creo cria crib cric crie crob croc croe croo cror eaba eaca eacc eaec eara earb eare earo ebac ebba ebbc ebbo ebbr ebcc eber ebic eboe eboo ebor ebro ecaa ecac ecai ecao ecar ecbc ecbe ecca eccb eccc ecce ecci ecco ecib eco- ecra ecrc ecri ecrr eeca eeea eeee eeoc eera eerc eero eiao eica eico eiec eiei eier eira eire eoir eora eore eori erba erbb erbe erca ercc erce ereb erec erei erer eria eric erie erio erob eroc eroe eroi eroo erra errc erre erro 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 ibro icaa icab icac icai icao icar icbc icca iccb iccc icci icco iccr icea icec icee icer icoc icor icra icrc icre icrr ieac iecc ieie ieio iera iere ieri iiac iica iiie iiii iiio iioi iioo iira iirc ioba iobi ioci ioee ioii ioio iooi iooo iora iore iori irac irae irai irao irar irbe irca ircc iree irer iri- iria