a-a a-c a-t aaa aac aae aaf aap aas aat ac- aca acc ace acf acp acs act aea aec aee aef aep aes aet af- afa afc afe aff afp afs aft ap- apa apc ape apf app aps apt as- asa asc ase asf asp ass ast at- ata atc ate atf atp ats att c-- caa cac cae caf cap cas cat cca ccc cce ccf ccp ccs cct ce- cea cec cee cef cep ces cet cfa cfc cfe cff cfp cfs cft cpa cpc cpe cpf cpp cps cpt csa csc cse csf csp css cst cta ctc cte ctf ctp cts ctt eaa eac eae eaf eap eas eat ec- eca ecc ece ecf ecs ect eea eec eee eef eep ees eet ef- efa efc efe eff efp efs eft ep- epa epc epe epf epp eps ept es- esa esc ese esf esp ess est eta etc ete etf etp ets ett faa fac fae faf fap fas fat fca fcc fce fcf fcp fcs fct fea fec fee fef fep fes fet ffa ffc ffe fff ffp ffs fft fpa fpc fpe fpp fps fpt fsa fsc fse fsf fsp fss fst fta ftc fte ftf ftp fts ftt p-p paa pac pae paf pap pas pat pca pcc pce pcf pcp pcs pct pea pec pee pef pep pes pet pfa pfc pfe pff pfp pfs pft ppa ppc ppe ppf ppp pps ppt ps- psa psc pse psf psp pss pst pt- pta ptc pte ptf ptp pts ptt saa sac sae saf sap sas sat sca scc sce scf scp scs sct se- sea sec see sef sep ses set sfa sfc sfe sff sfp sfs sft spa spc spe spf spp sps spt ss- ssa ssc sse ssf ssp sss sst sta stc ste stf stp sts stt taa tac tae taf tap tas tat tca tcc tce tcf tcp tcs tct te- tea tec tee tef tep tes tet tfa tfc tfe tff tfp tfs tft tpa tpc tpe tpf tpp tps tpt tsa tsc tse tsf tsp tss tst tta ttc tte ttf ttp tts ttt