a-a a-c aaa aac aad aae aas aax ac- aca acc acd ace acs acx ad- ada adc add ade ads adx aea aec aed aee aes aex as- asa asc asd ase ass asx ax- axa axe axs axx c-- caa cac cad cae cas cax cca ccc ccd cce ccs ccx cda cdc cdd cde cds cdx ce- cea cec ced cee ces cex csa csc csd cse css csx cxc cxs cxx daa dac dad dae das dax dca dcc dcd dce dcs dcx dda ddc ddd dde dds ddx de- dea dec ded dee des dex dsa dsc dsd dse dss dsx dxc dxd dxs dxx eaa eac ead eae eas eax ec- eca ecc ecd ece ecs ecx ed- eda edc edd ede eds edx eea eec eed eee ees eex es- esa esc esd ese ess esx ex- exa exc exd exe exs exx saa sac sad sae sas sax sca scc scd sce scs scx sda sdc sdd sde sds se- sea sec sed see ses sex ss- ssa ssc ssd sse sss ssx sxc sxs xaa xac xad xas xcd xcx xda xdc xde xds xed xee xes xex xsa xsc xss xxx