-er -ic a-a a-b a-c a-i aaa aab aac aae aai aap aar aas ab- aba abb abc abe abi abp abr abs ac- aca acb acc ace aci acp acr acs aea aeb aec aee aei aep aer aes ai- aia aib aic aie aii aip air ais ap- apa apb apc ape api app apr aps ar- ara arb arc are ari arp arr ars as- asa asb asc ase asi asp asr ass b-p baa bab bac bae bai bap bar bas bba bbb bbc bbe bbi bbp bbr bbs bca bcb bcc bce bci bcp bcr bcs be- bea beb bec bee bei bep ber bes bi- bia bib bic bie bii bip bir bis bpa bpb bpc bpe bpi bpp bpr bps bra brb bre bri brp brr brs bsa bsb bsc bse bsi bsp bsr bss c-- caa cab cac cae cai cap car cas cba cbb cbc cbe cbi cbp cbr cbs cca ccb ccc cce cci ccp ccr ccs ce- cea ceb cec cee cei cep cer ces ci- cia cib cic cie cii cip cir cis cpa cpb cpc cpe cpi cpp cpr cps cra crb crc cre cri crp crr crs csa csb csc cse csi csp csr css eaa eab eac eae eai eap ear eas eba ebb ebc ebe ebi ebp ebr ebs ec- eca ecb ecc ece eci ecr ecs eea eeb eec eee eep eer ees eia eib eic eie eii eip eir eis ep- epa epb epc epe epi epp epr eps era erb erc ere eri erp err ers es- esa esb esc ese esi esp esr ess ia- iaa iab iac iae iai iap iar ias iba ibb ibc ibe ibi ibp ibr ibs ica icb icc ice ici icp icr ics ie- iea iec iee iei iep ier ies iia iib iic iie iii iip iir iis ipa ipb ipc ipe ipi ipp ipr ips ir- ira irb irc ire iri irp irr irs is- isa isb isc ise isi isp isr iss p-p paa pab pac pae pai pap par pas pba pbb pbc pbe pbi pbp pbr pbs pca pcb pcc pce pci pcp pcr pcs pea peb pec pee pei pep per pes pia pib pic pie pii pip pir pis ppa ppb ppc ppe ppi ppp ppr pps pra prb prc pre pri prp prr prs ps- psa psb psc pse psi psp psr pss ra- raa rab rac rae rai rap rar ras rba rbb rbc rbe rbi rbp rbr rbs rca rcb rcc rce rci rcp rcr rcs re- rea reb rec ree rei rep rer res ria rib ric rie rii rip rir ris rpa rpb rpc rpe rpi rpp rpr rps rra rrb rrc rri rrp rrr rrs rsa rsb rsc rse rsi rsp rsr rss saa sab sac sae sai sap sar sas sba sbb sbc sbe sbi sbp sbr sbs sca scb scc sce sci scp scr scs se- sea seb sec see sei sep ser ses sia sib sic sie sii sip sir sis spa spb spc spe spi spp spr sps sr- sra srb src sre sri srp srr srs ss- ssa ssb ssc sse ssi ssp ssr sss