a-a aaa aad aap aav aay ad- ada add adp adv ady ap- apa apd app apv apy av- ava avd avp avy ay- aya ayd ayp daa dad dap dav day dda ddd ddp ddy dpa dpd dpp dpv dva dvd dvp dy- dya dyd dyp dyy p-p paa pad pap pav pay pda pdd pdp pdv ppa ppd ppp ppv pva pvd pvp pvv py- pya pyd v-a vaa vad vap vav vay vdd vdp vdv vpa vpd vpp vva vvv vyd vyp yaa yad yap yav yay yda ydy ypa ypd yva yvy yyy