a-a a-t aaa aad aap aas aat ad- ada add adp ads adt ap- apa apd app aps apt as- asa asd asp ass ast at- ata atd atp ats att daa dad dap das dat dda ddd ddp dds ddt dpa dpd dpp dps dpt dsa dsd dsp dss dst dta dtd dtp dts dtt p-p paa pad pap pas pat pda pdd pdp pds pdt ppa ppd ppp pps ppt ps- psa psd psp pss pst pt- pta ptd ptp pts ptt saa sad sap sas sat sda sdd sdp sds sdt spa spd spp sps spt ss- ssa ssd ssp sss sst sta std stp sts stt taa tad tap tas tat tda tdd tdp tds tdt tpa tpd tpp tps tpt tsa tsd tsp tss tst tta ttd ttp tts ttt