-er -ic a-a a-b a-c a-i a-t aaa aab aac aae aai aap aar aas aat ab- aba abb abc abe abi abp abr abs abt ac- aca acb acc ace aci acp acr acs act aea aeb aec aee aei aep aer aes aet ai- aia aib aic aie aii aip air ais ait ap- apa apb apc ape api app apr aps apt ar- ara arb arc are ari arp arr ars art as- asa asb asc ase asi asp asr ass ast at- ata atb atc ate ati atp atr ats att b-p baa bab bac bae bai bap bar bas bat bba bbb bbc bbe bbi bbp bbr bbs bbt bca bcb bcc bce bci bcp bcr bcs bct be- bea beb bec bee bei bep ber bes bet bi- bia bib bic bie bii bip bir bis bit bpa bpb bpc bpe bpi bpp bpr bps bpt bra brb bre bri brp brr brs brt bsa bsb bsc bse bsi bsp bsr bss bst bta btb btc bte bti btp btr bts btt c-- caa cab cac cae cai cap car cas cat cba cbb cbc cbe cbi cbp cbr cbs cbt cca ccb ccc cce cci ccp ccr ccs cct ce- cea ceb cec cee cei cep cer ces cet ci- cia cib cic cie cii cip cir cis cit cpa cpb cpc cpe cpi cpp cpr cps cpt cra crb crc cre cri crp crr crs crt csa csb csc cse csi csp csr css cst cta ctb ctc cte cti ctp ctr cts ctt eaa eab eac eae eai eap ear eas eat eba ebb ebc ebe ebi ebp ebr ebs ebt ec- eca ecb ecc ece eci ecr ecs ect eea eeb eec eee eep eer ees eet eia eib eic eie eii eip eir eis eit ep- epa epb epc epe epi epp epr eps ept era erb erc ere eri erp err ers ert es- esa esb esc ese esi esp esr ess est eta etb etc ete eti etp etr ets ett ia- iaa iab iac iae iai iap iar ias iat iba ibb ibc ibe ibi ibp ibr ibs ibt ica icb icc ice ici icp icr ics ict ie- iea iec iee iei iep ier ies iet iia iib iic iie iii iip iir iis iit ipa ipb ipc ipe ipi ipp ipr ips ipt ir- ira irb irc ire iri irp irr irs irt is- isa isb isc ise isi isp isr iss ist ita itb itc ite iti itp its itt p-p paa pab pac pae pai pap par pas pat pba pbb pbc pbe pbi pbp pbr pbs pbt pca pcb pcc pce pci pcp pcr pcs pct pea peb pec pee pei pep per pes pet pia pib pic pie pii pip pir pis pit ppa ppb ppc ppe ppi ppp ppr pps ppt pra prb prc pre pri prp prr prs prt ps- psa psb psc pse psi psp psr pss pst pt- pta ptb ptc pte pti ptp ptr pts ptt ra- raa rab rac rae rai rap rar ras rat rba rbb rbc rbe rbi rbp rbr rbs rbt rca rcb rcc rce rci rcp rcr rcs rct re- rea reb rec ree rei rep rer res ret ria rib ric rie rii rip rir ris rit rpa rpb rpc rpe rpi rpp rpr rps rpt rra rrb rrc rri rrp rrr rrs rrt rsa rsb rsc rse rsi rsp rsr rss rst rta rtb rtc rte rti rtp rtr rts rtt saa sab sac sae sai sap sar sas sat sba sbb sbc sbe sbi sbp sbr sbs sbt sca scb scc sce sci scp scr scs sct se- sea seb sec see sei sep ser ses set sia sib sic sie sii sip sir sis sit spa spb spc spe spi spp spr sps spt sr- sra srb src sre sri srp srr srs srt ss- ssa ssb ssc sse ssi ssp ssr sss sst sta stb stc ste sti stp str sts stt taa tab tac tae tai tap tar tas tat tba tbb tbc tbe tbi tbp tbr tbs tbt tca tcb tcc tce tci tcp tcr tcs tct te- tea teb tec tee tei tep ter tes tet tia tib tic tie tii tip tir tis tit tpa tpb tpc tpe tpi tpp tpr tps tpt tra trb trc tre tri trp trr trs trt tsa tsb tsc tse tsi tsp tsr tss tst tta ttb ttc tte tti ttp ttr tts ttt