-er -ic c-- ccc ccd cce cci ccr ccs ccx cdc cdd cde cdi cdr cds cdx ce- cec ced cee cei cer ces cex ci- cic cid cie cii cir cis cix crc crd cre cri crr crs crx csc csd cse csi csr css csx cxc cxi cxr cxs cxx dcc dcd dce dci dcr dcs dcx ddc ddd dde ddi ddr dds ddx de- dec ded dee dei der des dex di- dic did die dii dir dis dix drc drd dre dri drr drs drx dsc dsd dse dsi dsr dss dsx dxc dxd dxi dxr dxs dxx ec- ecc ecd ece eci ecr ecs ecx ed- edc edd ede edi edr eds edx eec eed eee eer ees eex eic eid eie eii eir eis eix erc erd ere eri err ers es- esc esd ese esi esr ess esx ex- exc exd exe exi exr exs exx i-d icc icd ice ici icr ics idc idd ide idi idr ids idx ie- iec ied iee iei ier ies iex iic iid iie iii iir iis iix ir- irc ird ire iri irr irs irx is- isc isd ise isi isr iss ixc ixe ixi rcc rcd rce rci rcr rcs rcx rdc rdd rde rdi rdr rds rdx re- rec red ree rei rer res rex ric rid rie rii rir ris rix rrc rrd rri rrr rrs rsc rsd rse rsi rsr rss rsx rxr rxs scc scd sce sci scr scs scx sdc sdd sde sdi sdr sds se- sec sed see sei ser ses sex sic sid sie sii sir sis six sr- src srd sre sri srr srs srx ss- ssc ssd sse ssi ssr sss ssx sxc sxi sxs xcd xci xcr xcx xdc xde xdi xdr xds xed xee xer xes xex xic xie xii xis xix xrc xrd xrx xsc xsi xss xxi xxx