-er -ic b-p bbb bbc bbe bbi bbp bbr bbs bcb bcc bce bci bcp bcr bcs be- beb bec bee bei bep ber bes bi- bib bic bie bii bip bir bis bpb bpc bpe bpi bpp bpr bps brb bre bri brp brr brs bsb bsc bse bsi bsp bsr bss c-- cbb cbc cbe cbi cbp cbr cbs ccb ccc cce cci ccp ccr ccs ce- ceb cec cee cei cep cer ces ci- cib cic cie cii cip cir cis cpb cpc cpe cpi cpp cpr cps crb crc cre cri crp crr crs csb csc cse csi csp csr css ebb ebc ebe ebi ebp ebr ebs ec- ecb ecc ece eci ecr ecs eeb eec eee eep eer ees eib eic eie eii eip eir eis ep- epb epc epe epi epp epr eps erb erc ere eri erp err ers es- esb esc ese esi esp esr ess ibb ibc ibe ibi ibp ibr ibs icb icc ice ici icp icr ics ie- iec iee iei iep ier ies iib iic iie iii iip iir iis ipb ipc ipe ipi ipp ipr ips ir- irb irc ire iri irp irr irs is- isb isc ise isi isp isr iss p-p pbb pbc pbe pbi pbp pbr pbs pcb pcc pce pci pcp pcr pcs peb pec pee pei pep per pes pib pic pie pii pip pir pis ppb ppc ppe ppi ppp ppr pps prb prc pre pri prp prr prs ps- psb psc pse psi psp psr pss rbb rbc rbe rbi rbp rbr rbs rcb rcc rce rci rcp rcr rcs re- reb rec ree rei rep rer res rib ric rie rii rip rir ris rpb rpc rpe rpi rpp rpr rps rrb rrc rri rrp rrr rrs rsb rsc rse rsi rsp rsr rss sbb sbc sbe sbi sbp sbr sbs scb scc sce sci scp scr scs se- seb sec see sei sep ser ses sib sic sie sii sip sir sis spb spc spe spi spp spr sps sr- srb src sre sri srp srr srs ss- ssb ssc sse ssi ssp ssr sss