a-a aaa aad aan aap aav ad- ada add adn adp adv an- ana and ann anp anv ap- apa apd apn app apv av- ava avd avn avp daa dad dan dap dav dda ddd ddn ddp dna dnd dnn dnp dpa dpd dpn dpp dpv dva dvd dvn dvp naa nad nan nap nav nda ndd ndn ndp ndv nna nnn nnp nnv npa npd npn npp npv nva nvd nvn nvp nvv p-p paa pad pan pap pav pda pdd pdn pdp pdv pn- pna pnd pnn pnp pnv ppa ppd ppn ppp ppv pva pvd pvn pvp pvv v-a vaa vad van vap vav vdd vdp vdv vn- vna vnd vnp vnv vpa vpd vpn vpp vva vvv