a-a a-b a-z aaa aab aam aan aao aaz ab- aba abb abm abn abo abz ama amb amm amn amo amz an- ana anb anm ann ano anz aoa aob aom aon aoo az- aza azb azm azn azo azz baa bab bam ban bao baz bba bbb bbm bbn bbo bma bmb bmm bmn bmo bmz bna bnb bnn bno bnz boa bob bom bon boo boz bza bzn bzo bzz m-o maa mab mam man mao maz mba mbb mbm mbo mma mmb mmm mmn mmo mmz mna mnb mnm mnn mno mnz moa mob mom mon moo moz mza mzb mzm mzn naa nab nam nan nao naz nba nbb nbm nbn nbo nma nmb nmm nmn nmo nmz nna nnb nnm nnn nno nnz no- noa nob nom non noo noz nzb nzo nzz oaa oab oam oan oao ob- oba obb obm obn obo om- oma omb omm omn omo omz on- ona onb onn ono oo- ooa oob oom oon ooo oza ozm ozo ozz zaa zab zam zan zao zaz zbb zbm zma zmb zmm znn zno zo- zoa zob zom zon zoo zzz