-er a-a a-b a-c a-t aaa aab aac aae aap aar aas aat ab- aba abb abc abe abp abr abs abt ac- aca acb acc ace acp acr acs act aea aeb aec aee aep aer aes aet ap- apa apb apc ape app apr aps apt ar- ara arb arc are arp arr ars art as- asa asb asc ase asp asr ass ast at- ata atb atc ate atp atr ats att b-p baa bab bac bae bap bar bas bat bba bbb bbc bbe bbp bbr bbs bbt bca bcb bcc bce bcp bcr bcs bct be- bea beb bec bee bep ber bes bet bpa bpb bpc bpe bpp bpr bps bpt bra brb bre brp brr brs brt bsa bsb bsc bse bsp bsr bss bst bta btb btc bte btp btr bts btt c-- caa cab cac cae cap car cas cat cba cbb cbc cbe cbp cbr cbs cbt cca ccb ccc cce ccp ccr ccs cct ce- cea ceb cec cee cep cer ces cet cpa cpb cpc cpe cpp cpr cps cpt cra crb crc cre crp crr crs crt csa csb csc cse csp csr css cst cta ctb ctc cte ctp ctr cts ctt eaa eab eac eae eap ear eas eat eba ebb ebc ebe ebp ebr ebs ebt ec- eca ecb ecc ece ecr ecs ect eea eeb eec eee eep eer ees eet ep- epa epb epc epe epp epr eps ept era erb erc ere erp err ers ert es- esa esb esc ese esp esr ess est eta etb etc ete etp etr ets ett p-p paa pab pac pae pap par pas pat pba pbb pbc pbe pbp pbr pbs pbt pca pcb pcc pce pcp pcr pcs pct pea peb pec pee pep per pes pet ppa ppb ppc ppe ppp ppr pps ppt pra prb prc pre prp prr prs prt ps- psa psb psc pse psp psr pss pst pt- pta ptb ptc pte ptp ptr pts ptt ra- raa rab rac rae rap rar ras rat rba rbb rbc rbe rbp rbr rbs rbt rca rcb rcc rce rcp rcr rcs rct re- rea reb rec ree rep rer res ret rpa rpb rpc rpe rpp rpr rps rpt rra rrb rrc rrp rrr rrs rrt rsa rsb rsc rse rsp rsr rss rst rta rtb rtc rte rtp rtr rts rtt saa sab sac sae sap sar sas sat sba sbb sbc sbe sbp sbr sbs sbt sca scb scc sce scp scr scs sct se- sea seb sec see sep ser ses set spa spb spc spe spp spr sps spt sr- sra srb src sre srp srr srs srt ss- ssa ssb ssc sse ssp ssr sss sst sta stb stc ste stp str sts stt taa tab tac tae tap tar tas tat tba tbb tbc tbe tbp tbr tbs tbt tca tcb tcc tce tcp tcr tcs tct te- tea teb tec tee tep ter tes tet tpa tpb tpc tpe tpp tpr tps tpt tra trb trc tre trp trr trs trt tsa tsb tsc tse tsp tsr tss tst tta ttb ttc tte ttp ttr tts ttt