-ic c-- ccc ccd cci ccr ccs cdc cdd cdi cdr cds ci- cic cid cii cir cis crc crd cri crr crs csc csd csi csr css dcc dcd dci dcr dcs ddc ddd ddi ddr dds di- dic did dii dir dis drc drd dri drr drs dsc dsd dsi dsr dss i-d icc icd ici icr ics idc idd idi idr ids iic iid iii iir iis ir- irc ird iri irr irs is- isc isd isi isr iss rcc rcd rci rcr rcs rdc rdd rdi rdr rds ric rid rii rir ris rrc rrd rri rrr rrs rsc rsd rsi rsr rss scc scd sci scr scs sdc sdd sdi sdr sds sic sid sii sir sis sr- src srd sri srr srs ss- ssc ssd ssi ssr sss