a-a a-b aaa aab aad aae aaf aah aas ab- aba abb abd abe abf abh abs ad- ada adb add ade adf adh ads aea aeb aed aee aef aeh aes af- afa afb afd afe aff afh afs aha ahb ahd ahe ahf ahh ahs as- asa asb asd ase asf ash ass baa bab bad bae baf bah bas bba bbb bbd bbe bbf bbh bbs bda bdb bdd bde bdf bdh bds be- bea beb bed bee bef beh bes bfa bfb bfd bfe bff bfh bfs bha bhb bhd bhe bhf bhh bhs bsa bsb bsd bse bsf bsh bss daa dab dad dae daf dah das dba dbb dbd dbe dbf dbh dbs dda ddb ddd dde ddf ddh dds de- dea deb ded dee def deh des dfa dfb dfd dfe dff dfh dfs dh- dha dhb dhd dhe dhf dhh dhs dsa dsb dsd dse dsf dsh dss eaa eab ead eae eaf eah eas eba ebb ebd ebe ebf ebh ebs ed- eda edb edd ede edf edh eds eea eeb eed eee eef ees ef- efa efb efd efe eff efh efs eha ehb ehd ehe ehf ehh ehs es- esa esb esd ese esf esh ess faa fab fad fae faf fah fas fba fbb fbd fbe fbf fbh fbs fda fdb fdd fde fdf fdh fds fea feb fed fee fef feh fes ffa ffd ffe fff ffh ffs fha fhb fhe fhf fhh fhs fsa fsb fsd fse fsf fsh fss haa hab had hae haf hah has hba hbb hbd hbe hbf hbh hbs hda hdb hdd hde hdf hdh hds he- hea heb hed hee hef heh hes hfa hfb hfd hfe hff hfh hfs hha hhb hhd hhe hhf hhh hhs hsa hsb hsd hse hsf hsh hss saa sab sad sae saf sah sas sba sbb sbd sbe sbf sbh sbs sda sdb sdd sde sdf sdh sds se- sea seb sed see sef seh ses sfa sfb sfd sfe sff sfh sfs sh- sha shb shd she shf shh shs ss- ssa ssb ssd sse ssf ssh sss