-ic bbb bbc bbd bbi bbo bcb bcc bcd bci bco bdb bdc bdd bdi bdo bi- bib bic bid bii bio bob boc bod boi boo c-- cbb cbc cbd cbi cbo ccb ccc ccd cci cco cdb cdc cdd cdi cdo ci- cib cic cid cii cio co- cob coc cod coi coo dbb dbc dbd dbi dbo dcb dcc dcd dci dco ddb ddc ddd ddi ddo di- dib dic did dii dio dob doc dod doi doo i-d ibb ibc ibd ibi ibo icb icc icd ici ico idb idc idd idi ido iib iic iid iii iio io- iob ioc iod ioi ioo o-i ob- obb obc obd obi obo oc- ocb occ ocd oci oco odb odc odd odi odo oib oic oid oii oio oo- oob ooc ood ooi ooo