a-a aaa aad aan aap aar aas ad- ada add adn adp adr ads an- ana and ann anp anr ans ap- apa apd apn app apr aps ar- ara ard arn arp arr ars as- asa asd asn asp asr ass daa dad dan dap dar das dda ddd ddn ddp ddr dds dna dnd dnn dnp dnr dns dpa dpd dpn dpp dpr dps dra drd drn drp drr drs dsa dsd dsn dsp dsr dss naa nad nan nap nar nas nda ndd ndn ndp ndr nds nna nnn nnp nns npa npd npn npp npr nps nra nrd nrn nrp nrr nrs nsa nsd nsn nsp nsr nss p-p paa pad pan pap par pas pda pdd pdn pdp pdr pds pn- pna pnd pnn pnp pnr pns ppa ppd ppn ppp ppr pps pra prd prn prp prr prs ps- psa psd psn psp psr pss ra- raa rad ran rap rar ras rda rdd rdn rdp rdr rds rna rnd rnn rnp rnr rns rpa rpd rpn rpp rpr rps rra rrd rrn rrp rrr rrs rsa rsd rsn rsp rsr rss saa sad san sap sar sas sda sdd sdn sdp sdr sds sna snd snn snp snr sns spa spd spn spp spr sps sr- sra srd srn srp srr srs ss- ssa ssd ssn ssp ssr sss