a-a a-b a-c aaa aab aac aad aak aan aao aar aay ab- aba abb abc abd abk abn abo abr aby ac- aca acb acc acd ack acn aco acr acy ad- ada adb adc add adk adn ado adr ady aka akb akc akd akk akn ako akr an- ana anb anc and ank ann ano anr any aoa aob aoc aod aok aon aoo aor ar- ara arb arc ard ark arn aro arr ary ay- aya ayc ayd ayk ayn ayo ayr baa bab bac bad bak ban bao bar bay bba bbb bbc bbd bbk bbn bbo bbr bby bca bcb bcc bcd bck bcn bco bcr bcy bda bdb bdc bdd bdk bdo bdr bdy bka bkb bkc bkk bkn bko bkr bna bnb bnc bnd bnk bnn bno bnr boa bob boc bod bok bon boo bor boy bra brb brd brk brn bro brr bry by- bya byc byd byk byn byo byr c-- caa cab cac cad cak can cao car cay cba cbb cbc cbd cbk cbn cbo cbr cby cca ccb ccc ccd cck ccn cco ccr cda cdb cdc cdd cdk cdn cdo cdr cdy cka ckb ckc ckd cko cky cn- cna cnb cnc cnd cnn cno cnr cny co- coa cob coc cod cok con coo cor coy cra crb crc crd crk crn cro crr cry cya cyb cyc cyd cyk cyn cyo cyr daa dab dac dad dak dan dao dar day dba dbb dbc dbd dbk dbn dbo dbr dby dca dcb dcc dcd dck dcn dco dcr dda ddb ddc ddd ddk ddn ddo ddr ddy dka dkb dkc dkk dko dkr dna dnb dnc dnd dnk dnn dno dnr dny doa dob doc dod dok don doo dor doy dra drb drc drd drk drn dro drr dry dy- dya dyb dyc dyd dyk dyn dyo dyr dyy ka- kaa kab kac kad kak kan kao kar kay kba kbb kbc kbd kbk kbn kbo kbr kca kcb kcc kcd kck kcn kcr kda kdb kdc kdk kdo kdr kdy kkb kkc kkk kkn kkr kky kn- kna knc knd knk knn kno knr koa kob koc kod kok kon koo kor koy kra krc krd krk krn kro krr kry kya kyc kyd kyn kyo kyr naa nab nac nad nak nan nao nar nay nba nbb nbc nbd nbk nbn nbo nbr nca ncb ncc ncd nck ncn nco ncr nda ndb ndc ndd ndk ndn ndo ndr ndy nka nkc nkk nkn nko nkr nky nna nnb nnc nnk nnn nno no- noa nob noc nod nok non noo nor noy nra nrb nrc nrd nrk nrn nro nrr nry nya nyc nyd nyk nyn nyo nyy oaa oab oac oad oak oan oao oar ob- oba obb obc obd obk obn obo obr oby oc- oca ocb occ ocd ock ocn oco ocr oda odb odc odd odn odo odr oka okb okc okd okk oko okr on- ona onb onc ond onk onn ono onr ony oo- ooa oob ooc ood ook oon ooo oor or- ora orb orc ord ork orn oro orr ory oya oyd oyo ra- raa rab rac rad rak ran rao rar ray rba rbb rbc rbd rbk rbn rbo rbr rca rcb rcc rcd rcn rco rcr rda rdb rdc rdd rdn rdo rdr rdy rkb rkc rkk rko rky rna rnb rnc rnd rnn rno rnr rny roa rob roc rod rok ron roo ror roy rra rrb rrc rrd rrk rrn rrr ry- rya ryc ryd ryk ryn ryo ryr ryy yaa yab yac yad yak yan yao yar yay ybc ybr yby yca ycc ycd yco ycy yda ydn ydo ydy yka ykk ykn yna ynd ynk ynn yny yob yoc yod yok yon yoo yor yoy yra yrc yrn yro yyb yyc yyy