a-a aaa aad aan aap aas ad- ada add adn adp ads an- ana and ann anp ans ap- apa apd apn app aps as- asa asd asn asp ass daa dad dan dap das dda ddd ddn ddp dds dna dnd dnn dnp dns dpa dpd dpn dpp dps dsa dsd dsn dsp dss naa nad nan nap nas nda ndd ndn ndp nds nna nnn nnp nns npa npd npn npp nps nsa nsd nsn nsp nss p-p paa pad pan pap pas pda pdd pdn pdp pds pn- pna pnd pnn pnp pns ppa ppd ppn ppp pps ps- psa psd psn psp pss saa sad san sap sas sda sdd sdn sdp sds sna snd snn snp sns spa spd spn spp sps ss- ssa ssd ssn ssp sss