a-a a-c aaa aac aad aao aax aay ac- aca acc acd aco acx acy ad- ada adc add ado adx ady aoa aoc aod aoo aox ax- axa axo axx ay- aya ayc ayd ayo ayx c-- caa cac cad cao cax cay cca ccc ccd cco ccx cda cdc cdd cdo cdx cdy co- coa coc cod coo cox coy cxc cxo cxx cya cyc cyd cyo daa dac dad dao dax day dca dcc dcd dco dcx dda ddc ddd ddo ddx ddy doa doc dod doo dox doy dxc dxd dxo dxx dy- dya dyc dyd dyo dyy oaa oac oad oao oax oc- oca occ ocd oco ocx oda odc odd odo oo- ooa ooc ood ooo oox ox- oxa oxc oxo oxx oxy oya oyd oyo xaa xac xad xcd xcx xda xdc xoa xoc xod xoo xox xxo xxx xxy xyy yaa yac yad yao yax yay yca ycc ycd yco ycy yda ydo ydy yoc yod yoo yox yoy yxa yxy yyc yyy