a-a a-t aaa aad aan aap aas aat ad- ada add adn adp ads adt an- ana and ann anp ans ant ap- apa apd apn app aps apt as- asa asd asn asp ass ast at- ata atd atn atp ats att daa dad dan dap das dat dda ddd ddn ddp dds ddt dna dnd dnn dnp dns dnt dpa dpd dpn dpp dps dpt dsa dsd dsn dsp dss dst dta dtd dtn dtp dts dtt naa nad nan nap nas nat nda ndd ndn ndp nds ndt nna nnn nnp nns nnt npa npd npn npp nps npt nsa nsd nsn nsp nss nst nta ntd ntn ntp nts ntt p-p paa pad pan pap pas pat pda pdd pdn pdp pds pdt pn- pna pnd pnn pnp pns pnt ppa ppd ppn ppp pps ppt ps- psa psd psn psp pss pst pt- pta ptd ptn ptp pts ptt saa sad san sap sas sat sda sdd sdn sdp sds sdt sna snd snn snp sns snt spa spd spn spp sps spt ss- ssa ssd ssn ssp sss sst sta std stn stp sts stt taa tad tan tap tas tat tda tdd tdn tdp tds tdt tna tnd tnn tnp tns tnt tpa tpd tpn tpp tps tpt tsa tsd tsn tsp tss tst tta ttd ttn ttp tts ttt