-ic bbb bbc bbd bbi bbs bcb bcc bcd bci bcs bdb bdc bdd bdi bds bi- bib bic bid bii bis bsb bsc bsd bsi bss c-- cbb cbc cbd cbi cbs ccb ccc ccd cci ccs cdb cdc cdd cdi cds ci- cib cic cid cii cis csb csc csd csi css dbb dbc dbd dbi dbs dcb dcc dcd dci dcs ddb ddc ddd ddi dds di- dib dic did dii dis dsb dsc dsd dsi dss i-d ibb ibc ibd ibi ibs icb icc icd ici ics idb idc idd idi ids iib iic iid iii iis is- isb isc isd isi iss sbb sbc sbd sbi sbs scb scc scd sci scs sdb sdc sdd sdi sds sib sic sid sii sis ss- ssb ssc ssd ssi sss