a-a a-b a-c aaa aab aac aad aae aaf aak aao ab- aba abb abc abd abe abf abk abo ac- aca acb acc acd ace acf ack aco ad- ada adb adc add ade adf adk ado aea aeb aec aed aee aef aek aeo af- afa afb afc afd afe aff afk afo aka akb akc akd ake akk ako aoa aob aoc aod aoe aof aok aoo baa bab bac bad bae baf bak bao bba bbb bbc bbd bbe bbf bbk bbo bca bcb bcc bcd bce bcf bck bco bda bdb bdc bdd bde bdf bdk bdo be- bea beb bec bed bee bef bek beo bfa bfb bfc bfd bfe bff bfo bka bkb bkc bke bkf bkk bko boa bob boc bod boe bof bok boo c-- caa cab cac cad cae caf cak cao cba cbb cbc cbd cbe cbf cbk cbo cca ccb ccc ccd cce ccf cck cco cda cdb cdc cdd cde cdf cdk cdo ce- cea ceb cec ced cee cef cek ceo cfa cfb cfc cfd cfe cff cfk cfo cka ckb ckc ckd cko co- coa cob coc cod coe cof cok coo daa dab dac dad dae daf dak dao dba dbb dbc dbd dbe dbf dbk dbo dca dcb dcc dcd dce dcf dck dco dda ddb ddc ddd dde ddf ddk ddo de- dea deb dec ded dee def dek deo dfa dfb dfc dfd dfe dff dfk dfo dka dkb dkc dke dkk dko doa dob doc dod doe dof dok doo eaa eab eac ead eae eaf eak eao eba ebb ebc ebd ebe ebf ebk ebo ec- eca ecb ecc ecd ece ecf eck eco ed- eda edb edc edd ede edf edk edo eea eeb eec eed eee eef eek eeo ef- efa efb efc efd efe eff efo eka ekb ekc ekd eke ekf eko eo- eoa eob eoc eod eoe eof eok eoo faa fab fac fad fae faf fak fao fba fbb fbc fbd fbe fbf fbk fbo fca fcb fcc fcd fce fcf fck fco fda fdb fdc fdd fde fdf fdk fdo fea feb fec fed fee fef fek feo ffa ffc ffd ffe fff ffk ffo fka fkb fkc fkf fkk foa fob foc foe fof fok foo ka- kaa kab kac kad kae kaf kak kao kba kbb kbc kbd kbe kbf kbk kbo kca kcb kcc kcd kce kck kda kdb kdc kde kdf kdk kdo ke- kea keb kec ked kee kef kek keo kfa kfc kfd kff kfo kkb kkc kke kkk koa kob koc kod koe kof kok koo oaa oab oac oad oae oaf oak oao ob- oba obb obc obd obe obf obk obo oc- oca ocb occ ocd ocf ock oco oda odb odc odd ode odf odo oea oeb oec oed oee oef oeo of- ofa ofb ofc ofd ofe off ofo oka okb okc okd oke okk oko oo- ooa oob ooc ood oof ook ooo

a-ak a-be a-do a-ok aaaa aaab aaac aaad aaae aaaf aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aack aaco aada aadc aade aaea aaec aafa aafb aafc aafd aaff aaka aake aaoe aaoo abaa abab abac abad abae abaf abak abb- abba abbb abbe abbo abca abcb abcc abcd abcf abda abdo abec abed abee abff aboa abob abod abof abok aboo acaa acab acac acad acae acba acca accc accd acce accf acco acda acdb acdc acde acdf ace- acea acec aced acek acfc acfd acfe ackd acke acoa acod acoe adaa adab adac adad adae adak adao adba adbc adcc adda addc addd adde addo adea adeb adee adeo adfa adfc adob adoc adod adoe adok adoo aeac aeaf aecb aede aeka afaa afad afak afao afca afcb afcc afdb afdc afee afek affa affc affo afka afoa afoe afoo akaa akae akao akca aked akee akka akko akok aoba aoca aoce baaa baad baaf baak baba babb babe babo bac- baca bacc bace back baco bada badb badd bade bado baed baek bafc baff bafo bak- baka bake bako bbad bbbb bbdd bbdo bbeb bbfc bcaa bcbc bcca bccc bcda bcde bcec bcfc bcof bdbc bddc bead beaf beak beba bebb bebe bebo beca beck beda bede bedo beeb beed beef beek befa befe beff befo beka beke beko beo- beod beof beok bfca boab boac boad boak boba bobb bobe bobo boca boce bock boco boda bodb bode bodo boea boec boee boef boeo bofa bofd bofe boff boka boke boko boob booc bood booe boof book c-bo c-cd caaa caab caac caaf caba cabe cabf cabo cac- caca cacc cace cack caco cada cadc cadd cade cado caec cafa cafb cafc cafe caff caka cake caod cbac cbbc cbca cbcc cbce cbdb cbdc cbdo cbea cbec cbee cbef cbfb cbfc cbka cbko ccaa ccab ccac ccad ccaf ccba ccbc ccca cccb cccc cccf ccdc ccdf cced ccee ccfa ccfc ccfd ccff ccob ccoc ccod cd-e cdaa cdac cdad cdba cdbf cdda cddb cdec cdef cdfa cdfe ceac cead ceba cec- ceca cece ceco ceda cedd cede cedo ceeb ceec cef- cefa cefc ceke cfaa cfab cfac cfae cfao cfbc cfca cfcb cfcf cfco cfda cffb cfoa ckac ckbc ckbe ckck ckco ckdo ckoa ckob ckoc ckoo coad coak coba cobb cobe cobo coca coce cock coco coda codd code coed cofc cofe coff cok- coka coke coko coob cood coof cook d-bo daab daad daae daba dabb dabo daca dace dada dade dado daeb dafa dafc dafe daff dafo daka dake dako dbcc dbfc dbfo dcbc dcca dccb dccc dcdb dcfc dddd ddoc deac dead deae deaf deak deba debe dec- deca decc decd dece deck deco deda dedd dede dedo deeb deed deef deek defe deff defo dek- deka deke dfaf dfcc dfco dffa dfoe dkba dkdc doab doae doak doba dobb dobe doca doce dock doco dod- doda dodd dode dodo doea doek doff doka doke doko