a-a aaa aad aan aap aar ad- ada add adn adp adr an- ana and ann anp anr ap- apa apd apn app apr ar- ara ard arn arp arr daa dad dan dap dar dda ddd ddn ddp ddr dna dnd dnn dnp dnr dpa dpd dpn dpp dpr dra drd drn drp drr naa nad nan nap nar nda ndd ndn ndp ndr nna nnn nnp npa npd npn npp npr nra nrd nrn nrp nrr p-p paa pad pan pap par pda pdd pdn pdp pdr pn- pna pnd pnn pnp pnr ppa ppd ppn ppp ppr pra prd prn prp prr ra- raa rad ran rap rar rda rdd rdn rdp rdr rna rnd rnn rnp rnr rpa rpd rpn rpp rpr rra rrd rrn rrp rrr