-er -ic c-- ccc ccd cce cci ccp ccr ccs cdc cdd cde cdi cdp cdr cds ce- cec ced cee cei cep cer ces ci- cic cid cie cii cip cir cis cpc cpd cpe cpi cpp cpr cps crc crd cre cri crp crr crs csc csd cse csi csp csr css dcc dcd dce dci dcp dcr dcs ddc ddd dde ddi ddp ddr dds de- dec ded dee dei dep der des di- dic did die dii dip dir dis dpc dpd dpe dpi dpp dpr dps drc drd dre dri drp drr drs dsc dsd dse dsi dsp dsr dss ec- ecc ecd ece eci ecr ecs ed- edc edd ede edi edp edr eds eec eed eee eep eer ees eic eid eie eii eip eir eis ep- epc epd epe epi epp epr eps erc erd ere eri erp err ers es- esc esd ese esi esp esr ess i-d icc icd ice ici icp icr ics idc idd ide idi idp idr ids ie- iec ied iee iei iep ier ies iic iid iie iii iip iir iis ipc ipd ipe ipi ipp ipr ips ir- irc ird ire iri irp irr irs is- isc isd ise isi isp isr iss p-p pcc pcd pce pci pcp pcr pcs pdc pdd pde pdi pdp pdr pds pec ped pee pei pep per pes pic pid pie pii pip pir pis ppc ppd ppe ppi ppp ppr pps prc prd pre pri prp prr prs ps- psc psd pse psi psp psr pss rcc rcd rce rci rcp rcr rcs rdc rdd rde rdi rdp rdr rds re- rec red ree rei rep rer res ric rid rie rii rip rir ris rpc rpd rpe rpi rpp rpr rps rrc rrd rri rrp rrr rrs rsc rsd rse rsi rsp rsr rss scc scd sce sci scp scr scs sdc sdd sde sdi sdp sdr sds se- sec sed see sei sep ser ses sic sid sie sii sip sir sis spc spd spe spi spp spr sps sr- src srd sre sri srp srr srs ss- ssc ssd sse ssi ssp ssr sss