a-a a-b a-q aaa aab aad aaf aaq aas ab- aba abb abd abf abq abs ad- ada adb add adf adq ads af- afa afb afd aff afq afs aqa aqf aqs as- asa asb asd asf asq ass baa bab bad baf baq bas bba bbb bbd bbf bbq bbs bda bdb bdd bdf bdq bds bfa bfb bfd bff bfq bfs bqd bsa bsb bsd bsf bss daa dab dad daf daq das dba dbb dbd dbf dbq dbs dda ddb ddd ddf ddq dds dfa dfb dfd dff dfq dfs dqa dqs dsa dsb dsd dsf dsq dss faa fab fad faf faq fas fba fbb fbd fbf fbs fda fdb fdd fdf fds ffa ffd fff ffs fsa fsb fsd fsf fsq fss qaa qad qaf qas qba qbd qbq qbs qda qdb qds qfa qfb qfd qff qfs qqq qsa qsd saa sab sad saf saq sas sba sbb sbd sbf sbq sbs sda sdb sdd sdf sdq sds sfa sfb sfd sff sfs sqa sqd sqq sqs ss- ssa ssb ssd ssf ssq sss