a-a a-c aaa aac aad aap aay ac- aca acc acd acp acy ad- ada adc add adp ady ap- apa apc apd app apy ay- aya ayc ayd ayp c-- caa cac cad cap cay cca ccc ccd ccp cda cdc cdd cdp cdy cpa cpc cpd cpp cya cyc cyd cyp daa dac dad dap day dca dcc dcd dcp dda ddc ddd ddp ddy dpa dpc dpd dpp dy- dya dyc dyd dyp dyy p-p paa pac pad pap pay pca pcc pcd pcp pda pdc pdd pdp ppa ppc ppd ppp py- pya pyc pyd yaa yac yad yap yay yca ycc ycd ycp ycy yda ydy ypa ypd yyc yyy