a-a a-b aaa aab aad aam aas ab- aba abb abd abm abs ad- ada adb add adm ads ama amb amd amm ams as- asa asb asd asm ass baa bab bad bam bas bba bbb bbd bbm bbs bda bdb bdd bdm bds bma bmb bmd bmm bms bsa bsb bsd bsm bss daa dab dad dam das dba dbb dbd dbm dbs dda ddb ddd ddm dds dma dmb dmd dmm dms dsa dsb dsd dsm dss maa mab mad mam mas mba mbb mbd mbm mbs mda mdb mdd mdm mds mma mmb mmd mmm mms msa msb msd msm mss saa sab sad sam sas sba sbb sbd sbm sbs sda sdb sdd sdm sds sma smb smd smm sms ss- ssa ssb ssd ssm sss