c-- ccc ccd ccr ccs ccw cdc cdd cdr cds cdw crc crd crr crs crw csc csd csr css csw cw- cwc cwd cwr cws dcc dcd dcr dcs dcw ddc ddd ddr dds ddw drc drd drr drs drw dsc dsd dsr dss dsw dwc dwr dws dww rcc rcd rcr rcs rcw rdc rdd rdr rds rrc rrd rrr rrs rsc rsd rsr rss rsw rwc rwd rwr rws scc scd scr scs scw sdc sdd sdr sds sdw sr- src srd srr srs srw ss- ssc ssd ssr sss ssw swc swd swr sws wcc wcd wcr wcs wcw wdc wdr wds wr- wrc wrd wrr wrs wrw wsc wsd wsr wss wsw wwc wwd www