-ic bbb bbc bbd bbi bbo bbs bcb bcc bcd bci bco bcs bdb bdc bdd bdi bdo bds bi- bib bic bid bii bio bis bob boc bod boi boo bos bsb bsc bsd bsi bso bss c-- cbb cbc cbd cbi cbo cbs ccb ccc ccd cci cco ccs cdb cdc cdd cdi cdo cds ci- cib cic cid cii cio cis co- cob coc cod coi coo cos csb csc csd csi cso css dbb dbc dbd dbi dbo dbs dcb dcc dcd dci dco dcs ddb ddc ddd ddi ddo dds di- dib dic did dii dio dis dob doc dod doi doo dos dsb dsc dsd dsi dso dss i-d ibb ibc ibd ibi ibo ibs icb icc icd ici ico ics idb idc idd idi ido ids iib iic iid iii iio iis io- iob ioc iod ioi ioo ios is- isb isc isd isi iso iss o-i ob- obb obc obd obi obo obs oc- ocb occ ocd oci oco ocs odb odc odd odi odo ods oib oic oid oii oio ois oo- oob ooc ood ooi ooo oos os- osb osc osd osi oso oss sbb sbc sbd sbi sbo sbs scb scc scd sci sco scs sdb sdc sdd sdi sdo sds sib sic sid sii sio sis sob soc sod soi soo sos ss- ssb ssc ssd ssi sso sss