a-a a-b aaa aab aad aae aaf aag aas ab- aba abb abd abe abf abg abs ad- ada adb add ade adf adg ads aea aeb aed aee aef aeg aes af- afa afb afd afe aff afg afs ag- aga agb agd age agf agg ags as- asa asb asd ase asf asg ass baa bab bad bae baf bag bas bba bbb bbd bbe bbf bbg bbs bda bdb bdd bde bdf bdg bds be- bea beb bed bee bef beg bes bfa bfb bfd bfe bff bfg bfs bga bgb bgd bge bgf bgg bgs bsa bsb bsd bse bsf bsg bss daa dab dad dae daf dag das dba dbb dbd dbe dbf dbg dbs dda ddb ddd dde ddf ddg dds de- dea deb ded dee def deg des dfa dfb dfd dfe dff dfg dfs dga dgd dge dgf dgg dgs dsa dsb dsd dse dsf dsg dss eaa eab ead eae eaf eag eas eba ebb ebd ebe ebf ebg ebs ed- eda edb edd ede edf edg eds eea eeb eed eee eef eeg ees ef- efa efb efd efe eff efg efs ega egb egd ege egf egg egs es- esa esb esd ese esf esg ess faa fab fad fae faf fag fas fba fbb fbd fbe fbf fbg fbs fda fdb fdd fde fdf fdg fds fea feb fed fee fef feg fes ffa ffd ffe fff ffg ffs fga fgb fgd fge fgf fgg fgs fsa fsb fsd fse fsf fsg fss g-d gaa gab gad gae gaf gag gas gba gbd gbe gbf gbg gbs gda gdb gdd gde gdf gds ge- gea geb ged gee gef geg ges gfa gfb gfd gfe gff gfs gga ggb ggd ggg ggs gsa gsb gsd gse gsf gsg gss saa sab sad sae saf sag sas sba sbb sbd sbe sbf sbg sbs sda sdb sdd sde sdf sdg sds se- sea seb sed see sef seg ses sfa sfb sfd sfe sff sfg sfs sga sgb sgd sge sgf sgg sgs ss- ssa ssb ssd sse ssf ssg sss