a-a a-b a-c a-t aaa aab aac aae aap aas aat ab- aba abb abc abe abp abs abt ac- aca acb acc ace acp acs act aea aeb aec aee aep aes aet ap- apa apb apc ape app aps apt as- asa asb asc ase asp ass ast at- ata atb atc ate atp ats att b-p baa bab bac bae bap bas bat bba bbb bbc bbe bbp bbs bbt bca bcb bcc bce bcp bcs bct be- bea beb bec bee bep bes bet bpa bpb bpc bpe bpp bps bpt bsa bsb bsc bse bsp bss bst bta btb btc bte btp bts btt c-- caa cab cac cae cap cas cat cba cbb cbc cbe cbp cbs cbt cca ccb ccc cce ccp ccs cct ce- cea ceb cec cee cep ces cet cpa cpb cpc cpe cpp cps cpt csa csb csc cse csp css cst cta ctb ctc cte ctp cts ctt eaa eab eac eae eap eas eat eba ebb ebc ebe ebp ebs ebt ec- eca ecb ecc ece ecs ect eea eeb eec eee eep ees eet ep- epa epb epc epe epp eps ept es- esa esb esc ese esp ess est eta etb etc ete etp ets ett p-p paa pab pac pae pap pas pat pba pbb pbc pbe pbp pbs pbt pca pcb pcc pce pcp pcs pct pea peb pec pee pep pes pet ppa ppb ppc ppe ppp pps ppt ps- psa psb psc pse psp pss pst pt- pta ptb ptc pte ptp pts ptt saa sab sac sae sap sas sat sba sbb sbc sbe sbp sbs sbt sca scb scc sce scp scs sct se- sea seb sec see sep ses set spa spb spc spe spp sps spt ss- ssa ssb ssc sse ssp sss sst sta stb stc ste stp sts stt taa tab tac tae tap tas tat tba tbb tbc tbe tbp tbs tbt tca tcb tcc tce tcp tcs tct te- tea teb tec tee tep tes tet tpa tpb tpc tpe tpp tps tpt tsa tsb tsc tse tsp tss tst tta ttb ttc tte ttp tts ttt