-er -ic c-- ccc ccd cce cci ccr ccs ccv cdc cdd cde cdi cdr cds cdv ce- cec ced cee cei cer ces cev ci- cic cid cie cii cir cis civ crc crd cre cri crr crs crv csc csd cse csi csr css csv cvc cvd cve cvi cvr cvs cvv dcc dcd dce dci dcr dcs dcv ddc ddd dde ddi ddr dds de- dec ded dee dei der des dev di- dic did die dii dir dis div drc drd dre dri drr drs drv dsc dsd dse dsi dsr dss dsv dvc dvd dve dvi dvr dvs ec- ecc ecd ece eci ecr ecs ecv ed- edc edd ede edi edr eds eec eed eee eer ees eev eic eid eie eii eir eis eiv erc erd ere eri err ers erv es- esc esd ese esi esr ess esv evc evd eve evi evr evs evv i-d i-v icc icd ice ici icr ics icv idc idd ide idi idr ids idv ie- iec ied iee iei ier ies iev iic iid iie iii iir iis ir- irc ird ire iri irr irs irv is- isc isd ise isi isr iss isv ivc ivd ive ivi ivr ivs ivv rcc rcd rce rci rcr rcs rcv rdc rdd rde rdi rdr rds rdv re- rec red ree rei rer res rev ric rid rie rii rir ris riv rrc rrd rri rrr rrs rsc rsd rse rsi rsr rss rsv rvc rvd rve rvi rvr rvs rvv scc scd sce sci scr scs scv sdc sdd sde sdi sdr sds sdv se- sec sed see sei ser ses sev sic sid sie sii sir sis siv sr- src srd sre sri srr srs srv ss- ssc ssd sse ssi ssr sss ssv svc svd sve svi svr svs svv v-e vcc vcd vce vci vcr vcs vdc vdd vde vdi vdr vds vdv vec ved vee vei ver ves vi- vic vid vie vii vir vis viv vrc vrd vre vri vrr vrs vsc vsd vse vsi vsr vss vsv vvc vvi vvr vvs vvv