a-a a-b a-t aaa aab aad aap aas aat ab- aba abb abd abp abs abt ad- ada adb add adp ads adt ap- apa apb apd app aps apt as- asa asb asd asp ass ast at- ata atb atd atp ats att b-p baa bab bad bap bas bat bba bbb bbd bbp bbs bbt bda bdb bdd bdp bds bdt bpa bpb bpd bpp bps bpt bsa bsb bsd bsp bss bst bta btb btd btp bts btt daa dab dad dap das dat dba dbb dbd dbp dbs dbt dda ddb ddd ddp dds ddt dpa dpb dpd dpp dps dpt dsa dsb dsd dsp dss dst dta dtb dtd dtp dts dtt p-p paa pab pad pap pas pat pba pbb pbd pbp pbs pbt pda pdb pdd pdp pds pdt ppa ppb ppd ppp pps ppt ps- psa psb psd psp pss pst pt- pta ptb ptd ptp pts ptt saa sab sad sap sas sat sba sbb sbd sbp sbs sbt sda sdb sdd sdp sds sdt spa spb spd spp sps spt ss- ssa ssb ssd ssp sss sst sta stb std stp sts stt taa tab tad tap tas tat tba tbb tbd tbp tbs tbt tda tdb tdd tdp tds tdt tpa tpb tpd tpp tps tpt tsa tsb tsd tsp tss tst tta ttb ttd ttp tts ttt