a-a a-b aaa aab aad aaf aaj aak aan aao aar ab- aba abb abd abf abj abk abn abo abr ad- ada adb add adf adj adk adn ado adr af- afa afb afd aff afj afk afn afo afr aja ajb ajd ajf ajj ajk ajn ajo ajr aka akb akd akj akk akn ako akr an- ana anb and anf anj ank ann ano anr aoa aob aod aof aoj aok aon aoo aor ar- ara arb ard arf arj ark arn aro arr baa bab bad baf baj bak ban bao bar bba bbb bbd bbf bbk bbn bbo bbr bda bdb bdd bdf bdj bdk bdo bdr bfa bfb bfd bff bfj bfn bfo bfr bja bjd bjf bjj bjk bjn bjr bka bkb bkf bkk bkn bko bkr bna bnb bnd bnf bnj bnk bnn bno bnr boa bob bod bof boj bok bon boo bor bra brb brd brf brj brk brn bro brr daa dab dad daf daj dak dan dao dar dba dbb dbd dbf dbk dbn dbo dbr dda ddb ddd ddf ddk ddn ddo ddr dfa dfb dfd dff dfj dfk dfn dfo dfr dj- dja djb djd djf djk djo dka dkb dkk dko dkr dna dnb dnd dnf dnj dnk dnn dno dnr doa dob dod dof doj dok don doo dor dra drb drd drj drk drn dro drr faa fab fad faf faj fak fan fao far fba fbb fbd fbf fbk fbn fbo fbr fda fdb fdd fdf fdj fdk fdn fdo fdr ffa ffd fff ffk ffn ffo ffr fja fjb fjd fka fkb fkf fkj fkk fna fnb fnd fnf fnj fnk fnn fnr foa fob fof fok fon foo for fra frb frd frf frj frk frn fro frr j-d jaa jab jad jaf jaj jak jan jao jar jba jbf jbj jbk jbo jbr jda jdb jdf jdn jdo jdr jfa jfb jfd jff jfj jfk jfo jfr jja jjb jjf jjj jjk jjr jka jkb jkk jkn jko jkr jna jnd jnf jnj jnn jno jnr joa job jod jof joj jok jon joo jor jra jrb jrf jrk jrn jro jrr ka- kaa kab kad kaf kaj kak kan kao kar kba kbb kbd kbf kbk kbn kbo kbr kda kdb kdf kdk kdo kdr kfa kfd kff kfo kjb kjr kkb kkk kkn kkr kn- kna knd knf knk knn kno knr koa kob kod kof kok kon koo kor kra krd krf krk krn kro krr naa nab nad naf naj nak nan nao nar nba nbb nbd nbf nbk nbn nbo nbr nda ndb ndd ndf ndk ndn ndo ndr nfa nfb nfd nff nfk nfn nfo nfr nja njf njk njn nka nkf nkj nkk nkn nko nkr nna nnb nnf nnk nnn nno no- noa nob nod nof noj nok non noo nor nra nrb nrd nrf nrj nrk nrn nro nrr oaa oab oad oaf oaj oak oan oao oar ob- oba obb obd obf obj obk obn obo obr oda odb odd odf odn odo odr of- ofa ofb ofd off ofn ofo ofr oja ojb ojd ojo oka okb okd okj okk oko okr on- ona onb ond onf onj onk onn ono onr oo- ooa oob ood oof ook oon ooo oor or- ora orb ord orf ork orn oro orr ra- raa rab rad raf raj rak ran rao rar rba rbb rbd rbf rbk rbn rbo rbr rda rdb rdd rdf rdj rdn rdo rdr rfa rfb rfd rff rfj rfk rfn rfo rfr rja rjf rjk rjr rkb rkf rkk rko rna rnb rnd rnn rno rnr roa rob rod rof roj rok ron roo ror rra rrb rrd rrf rrk rrn rrr