a-a a-b aaa aab aad aam aas aax ab- aba abb abd abm abs abx ad- ada adb add adm ads adx ama amb amd amm ams amx as- asa asb asd asm ass asx ax- axa axm axs axx baa bab bad bam bas bax bba bbb bbd bbm bbs bbx bda bdb bdd bdm bds bdx bma bmb bmd bmm bms bmx bsa bsb bsd bsm bss bsx bxb bxd bxm bxx daa dab dad dam das dax dba dbb dbd dbm dbs dbx dda ddb ddd ddm dds ddx dma dmb dmd dmm dms dmx dsa dsb dsd dsm dss dsx dxd dxs dxx maa mab mad mam mas max mba mbb mbd mbm mbs mbx mda mdb mdd mdm mds mdx mma mmb mmd mmm mms mmx msa msb msd msm mss msx mxa mxd mxs saa sab sad sam sas sax sba sbb sbd sbm sbs sbx sda sdb sdd sdm sds sma smb smd smm sms smx ss- ssa ssb ssd ssm sss ssx sxm sxs xaa xad xam xas xbx xda xdb xdm xds xma xmd xmm xms xmx xsa xsb xsm xss xxx