a-a a-t aaa aad aao aap aas aat ad- ada add ado adp ads adt aoa aod aoo aop aos aot ap- apa apd apo app aps apt as- asa asd aso asp ass ast at- ata atd ato atp ats att daa dad dao dap das dat dda ddd ddo ddp dds ddt doa dod doo dop dos dot dpa dpd dpo dpp dps dpt dsa dsd dso dsp dss dst dta dtd dto dtp dts dtt oaa oad oao oap oas oat oda odd odo odp ods odt oo- ooa ood ooo oop oos oot op- opa opd opo opp ops opt os- osa osd oso osp oss ost ot- ota otd oto otp ots ott p-p paa pad pao pap pas pat pda pdd pdo pdp pds pdt poa pod poo pop pos pot ppa ppd ppo ppp pps ppt ps- psa psd pso psp pss pst pt- pta ptd pto ptp pts ptt saa sad sao sap sas sat sda sdd sdo sdp sds sdt soa sod soo sop sos sot spa spd spo spp sps spt ss- ssa ssd sso ssp sss sst sta std sto stp sts stt taa tad tao tap tas tat tda tdd tdo tdp tds tdt to- toa tod too top tos tot tpa tpd tpo tpp tps tpt tsa tsd tso tsp tss tst tta ttd tto ttp tts ttt