a-a a-b a-z aaa aab aad aan aao aar aau aaz ab- aba abb abd abn abo abr abu abz ad- ada adb add adn ado adr adu adz an- ana anb and ann ano anr anu anz aoa aob aod aon aoo aor aou ar- ara arb ard arn aro arr aru arz au- aua aub aud aun auo aur auz az- aza azb azd azn azo azu azz b-u baa bab bad ban bao bar bau baz bba bbb bbd bbn bbo bbr bbu bda bdb bdd bdo bdr bdu bdz bna bnb bnd bnn bno bnr bnu bnz boa bob bod bon boo bor bou boz bra brb brd brn bro brr bru brz bua bub bud bun buo bur buu buz bza bzd bzn bzo bzr bzu bzz daa dab dad dan dao dar dau daz dba dbb dbd dbn dbo dbr dbu dbz dda ddb ddd ddn ddo ddr ddu ddz dna dnb dnd dnn dno dnr dnz doa dob dod don doo dor dou doz dra drb drd drn dro drr dru drz dua dub dud dun duo dur duz dza dzb dzd dzo dzr dzu naa nab nad nan nao nar nau naz nba nbb nbd nbn nbo nbr nbu nda ndb ndd ndn ndo ndr ndu nna nnb nnn nno nnu nnz no- noa nob nod non noo nor nou noz nra nrb nrd nrn nro nrr nru nrz nua nub nud nun nuo nur nuu nzb nzd nzo nzz oaa oab oad oan oao oar oau ob- oba obb obd obn obo obr obu oda odb odd odn odo odr odu on- ona onb ond onn ono onr onu oo- ooa oob ood oon ooo oor or- ora orb ord orn oro orr oru orz ou- oua oud oun ouo our oza ozo ozu ozz ra- raa rab rad ran rao rar rau raz rba rbb rbd rbn rbo rbr rbu rda rdb rdd rdn rdo rdr rdu rna rnb rnd rnn rno rnr rnu rnz roa rob rod ron roo ror rou roz rra rrb rrd rrn rrr rru rua rub rud run ruo rur ruu ruz rza rzb rzo ua- uaa uab uad uan uao uar uau uaz uba ubb ubn ubo ubr ubu uda udb udd udn udo udr udu un- una unb und unn uno unr unu uoa uob uod uon uoo uor ur- ura urb urd urn uro urr uru urz uua uun uur uuu uza uzb uzo uzu zaa zab zad zan zao zar zaz zbb zbr znd znn zno zo- zoa zob zod zon zoo zor zou zro zub zud zun zur zuz zzr zzz