a-a a-b a-z aaa aab aae aam aao aaz ab- aba abb abe abm abo abz aea aeb aee aem aeo aez ama amb ame amm amo amz aoa aob aoe aom aoo az- aza azb aze azm azo azz baa bab bae bam bao baz bba bbb bbe bbm bbo be- bea beb bee bem beo bez bma bmb bme bmm bmo bmz boa bob boe bom boo boz bza bze bzo bzz eaa eab eae eam eao eaz eba ebb ebe ebm ebo eea eeb eee eem eeo em- ema emb eme emm emo eo- eoa eob eoe eom eoo eze ezo ezz m-o maa mab mae mam mao maz mba mbb mbe mbm mbo mea meb mee mem meo mez mma mmb mme mmm mmo mmz moa mob moe mom moo moz mza mzb mzm oaa oab oae oam oao ob- oba obb obe obm obo oea oeb oee oem oeo om- oma omb ome omm omo omz oo- ooa oob oom ooo oza oze ozm ozo ozz zaa zab zam zao zaz zbb zbm zea zeb zee zem zeo zez zma zmb zmm zo- zoa zob zoe zom zoo zzz