-ic bbb bbc bbd bbi bbo bbr bbs bcb bcc bcd bci bco bcr bcs bdb bdc bdd bdi bdo bdr bds bi- bib bic bid bii bio bir bis bob boc bod boi boo bor bos brb brd bri bro brr brs bsb bsc bsd bsi bso bsr bss c-- cbb cbc cbd cbi cbo cbr cbs ccb ccc ccd cci cco ccr ccs cdb cdc cdd cdi cdo cdr cds ci- cib cic cid cii cio cir cis co- cob coc cod coi coo cor cos crb crc crd cri cro crr crs csb csc csd csi cso csr css dbb dbc dbd dbi dbo dbr dbs dcb dcc dcd dci dco dcr dcs ddb ddc ddd ddi ddo ddr dds di- dib dic did dii dio dir dis dob doc dod doi doo dor dos drb drc drd dri dro drr drs dsb dsc dsd dsi dso dsr dss i-d ibb ibc ibd ibi ibo ibr ibs icb icc icd ici ico icr ics idb idc idd idi ido idr ids iib iic iid iii iio iir iis io- iob ioc iod ioi ioo ior ios ir- irb irc ird iri iro irr irs is- isb isc isd isi iso isr iss o-i ob- obb obc obd obi obo obr obs oc- ocb occ ocd oci oco ocr ocs odb odc odd odi odo odr ods oib oic oid oii oio oir ois oo- oob ooc ood ooi ooo oor oos or- orb orc ord ori oro orr ors os- osb osc osd osi oso osr oss rbb rbc rbd rbi rbo rbr rbs rcb rcc rcd rci rco rcr rcs rdb rdc rdd rdi rdo rdr rds rib ric rid rii rio rir ris rob roc rod roi roo ror ros rrb rrc rrd rri rrr rrs rsb rsc rsd rsi rso rsr rss sbb sbc sbd sbi sbo sbr sbs scb scc scd sci sco scr scs sdb sdc sdd sdi sdo sdr sds sib sic sid sii sio sir sis sob soc sod soi soo sor sos sr- srb src srd sri sro srr srs ss- ssb ssc ssd ssi sso ssr sss