a-a a-b a-z aaa aab aad aan aao aaz ab- aba abb abd abn abo abz ad- ada adb add adn ado adz an- ana anb and ann ano anz aoa aob aod aon aoo az- aza azb azd azn azo azz baa bab bad ban bao baz bba bbb bbd bbn bbo bda bdb bdd bdo bdz bna bnb bnd bnn bno bnz boa bob bod bon boo boz bza bzd bzn bzo bzz daa dab dad dan dao daz dba dbb dbd dbn dbo dbz dda ddb ddd ddn ddo ddz dna dnb dnd dnn dno dnz doa dob dod don doo doz dza dzb dzd dzo naa nab nad nan nao naz nba nbb nbd nbn nbo nda ndb ndd ndn ndo nna nnb nnn nno nnz no- noa nob nod non noo noz nzb nzd nzo nzz oaa oab oad oan oao ob- oba obb obd obn obo oda odb odd odn odo on- ona onb ond onn ono oo- ooa oob ood oon ooo oza ozo ozz zaa zab zad zan zao zaz zbb znd znn zno zo- zoa zob zod zon zoo zzz