-ic bbb bbc bbd bbi bbr bcb bcc bcd bci bcr bdb bdc bdd bdi bdr bi- bib bic bid bii bir brb brd bri brr c-- cbb cbc cbd cbi cbr ccb ccc ccd cci ccr cdb cdc cdd cdi cdr ci- cib cic cid cii cir crb crc crd cri crr dbb dbc dbd dbi dbr dcb dcc dcd dci dcr ddb ddc ddd ddi ddr di- dib dic did dii dir drb drc drd dri drr i-d ibb ibc ibd ibi ibr icb icc icd ici icr idb idc idd idi idr iib iic iid iii iir ir- irb irc ird iri irr rbb rbc rbd rbi rbr rcb rcc rcd rci rcr rdb rdc rdd rdi rdr rib ric rid rii rir rrb rrc rrd rri rrr