-ic c-- ccc ccd cci cck ccs cdc cdd cdi cdk cds ci- cic cid cii cik cis ckc ckd cki cks csc csd csi csk css dcc dcd dci dck dcs ddc ddd ddi ddk dds di- dic did dii dik dis dkc dki dkk dks dsc dsd dsi dsk dss i-d icc icd ici ick ics idc idd idi idk ids iic iid iii iis ikc iki ikk iks is- isc isd isi isk iss kcc kcd kci kck kcs kdc kdk kds kic kid kii kik kis kkc kki kkk kks ksc ksd ksi ksk kss scc scd sci sck scs sdc sdd sdi sdk sds sic sid sii sik sis sk- skc skd ski skk sks ss- ssc ssd ssi ssk sss