a-a a-b a-z aaa aab aad aae aaf aah aaz ab- aba abb abd abe abf abh abz ad- ada adb add ade adf adh adz aea aeb aed aee aef aeh aez af- afa afb afd afe aff afh afz aha ahb ahd ahe ahf ahh ahz az- aza azb azd aze azf azz baa bab bad bae baf bah baz bba bbb bbd bbe bbf bbh bda bdb bdd bde bdf bdh bdz be- bea beb bed bee bef beh bez bfa bfb bfd bfe bff bfh bfz bha bhb bhd bhe bhf bhh bza bzd bze bzf bzh bzz daa dab dad dae daf dah daz dba dbb dbd dbe dbf dbh dbz dda ddb ddd dde ddf ddh ddz de- dea deb ded dee def deh dez dfa dfb dfd dfe dff dfh dfz dh- dha dhb dhd dhe dhf dhh dza dzb dzd dze eaa eab ead eae eaf eah eaz eba ebb ebd ebe ebf ebh ed- eda edb edd ede edf edh eea eeb eed eee eef ef- efa efb efd efe eff efh eha ehb ehd ehe ehf ehh eze ezf ezh ezz faa fab fad fae faf fah faz fba fbb fbd fbe fbf fbh fda fdb fdd fde fdf fdh fea feb fed fee fef feh fez ffa ffd ffe fff ffh ffz fha fhb fhe fhf fhh fzd fzh haa hab had hae haf hah haz hba hbb hbd hbe hbf hbh hbz hda hdb hdd hde hdf hdh hdz he- hea heb hed hee hef heh hez hfa hfb hfd hfe hff hfh hha hhb hhd hhe hhf hhh hhz hzd hze zaa zab zad zaf zah zaz zbb zdf zea zeb zed zee zef zeh zez zfa zfd zha zhe zzz