-ic bbb bbc bbd bbi bbr bbs bcb bcc bcd bci bcr bcs bdb bdc bdd bdi bdr bds bi- bib bic bid bii bir bis brb brd bri brr brs bsb bsc bsd bsi bsr bss c-- cbb cbc cbd cbi cbr cbs ccb ccc ccd cci ccr ccs cdb cdc cdd cdi cdr cds ci- cib cic cid cii cir cis crb crc crd cri crr crs csb csc csd csi csr css dbb dbc dbd dbi dbr dbs dcb dcc dcd dci dcr dcs ddb ddc ddd ddi ddr dds di- dib dic did dii dir dis drb drc drd dri drr drs dsb dsc dsd dsi dsr dss i-d ibb ibc ibd ibi ibr ibs icb icc icd ici icr ics idb idc idd idi idr ids iib iic iid iii iir iis ir- irb irc ird iri irr irs is- isb isc isd isi isr iss rbb rbc rbd rbi rbr rbs rcb rcc rcd rci rcr rcs rdb rdc rdd rdi rdr rds rib ric rid rii rir ris rrb rrc rrd rri rrr rrs rsb rsc rsd rsi rsr rss sbb sbc sbd sbi sbr sbs scb scc scd sci scr scs sdb sdc sdd sdi sdr sds sib sic sid sii sir sis sr- srb src srd sri srr srs ss- ssb ssc ssd ssi ssr sss