a-a a-b a-z aaa aab aad aak aan aao aar aaz ab- aba abb abd abk abn abo abr abz ad- ada adb add adk adn ado adr adz aka akb akd akk akn ako akr an- ana anb and ank ann ano anr anz aoa aob aod aok aon aoo aor ar- ara arb ard ark arn aro arr arz az- aza azb azd azn azo azz baa bab bad bak ban bao bar baz bba bbb bbd bbk bbn bbo bbr bda bdb bdd bdk bdo bdr bdz bka bkb bkk bkn bko bkr bna bnb bnd bnk bnn bno bnr bnz boa bob bod bok bon boo bor boz bra brb brd brk brn bro brr brz bza bzd bzn bzo bzr bzz daa dab dad dak dan dao dar daz dba dbb dbd dbk dbn dbo dbr dbz dda ddb ddd ddk ddn ddo ddr ddz dka dkb dkk dko dkr dna dnb dnd dnk dnn dno dnr dnz doa dob dod dok don doo dor doz dra drb drd drk drn dro drr drz dza dzb dzd dzo dzr k-z ka- kaa kab kad kak kan kao kar kaz kba kbb kbd kbk kbn kbo kbr kbz kda kdb kdk kdo kdr kkb kkk kkn kkr kn- kna knd knk knn kno knr koa kob kod kok kon koo kor koz kra krd krk krn kro krr kzo naa nab nad nak nan nao nar naz nba nbb nbd nbk nbn nbo nbr nda ndb ndd ndk ndn ndo ndr nka nkk nkn nko nkr nna nnb nnk nnn nno nnz no- noa nob nod nok non noo nor noz nra nrb nrd nrk nrn nro nrr nrz nzb nzd nzo nzz oaa oab oad oak oan oao oar ob- oba obb obd obk obn obo obr oda odb odd odn odo odr oka okb okd okk oko okr on- ona onb ond onk onn ono onr oo- ooa oob ood ook oon ooo oor or- ora orb ord ork orn oro orr orz oza ozo ozz ra- raa rab rad rak ran rao rar raz rba rbb rbd rbk rbn rbo rbr rda rdb rdd rdn rdo rdr rkb rkk rko rkz rna rnb rnd rnn rno rnr rnz roa rob rod rok ron roo ror roz rra rrb rrd rrk rrn rrr rza rzb rzo zaa zab zad zak zan zao zar zaz zbb zbr zka znd znn zno zo- zoa zob zod zok zon zoo zor zro zzr zzz