-ic bbb bbc bbd bbi bbn bbo bcb bcc bcd bci bcn bco bdb bdc bdd bdi bdo bi- bib bic bid bii bin bio bnb bnc bnd bni bnn bno bob boc bod boi bon boo c-- cbb cbc cbd cbi cbn cbo ccb ccc ccd cci ccn cco cdb cdc cdd cdi cdn cdo ci- cib cic cid cii cin cio cn- cnb cnc cnd cni cnn cno co- cob coc cod coi con coo dbb dbc dbd dbi dbn dbo dcb dcc dcd dci dcn dco ddb ddc ddd ddi ddn ddo di- dib dic did dii din dio dnb dnc dnd dni dnn dno dob doc dod doi don doo i-d ibb ibc ibd ibi ibn ibo icb icc icd ici icn ico idb idc idd idi idn ido iib iic iid iii iin iio in- inb inc ind ini inn ino io- iob ioc iod ioi ion ioo n-i nbb nbc nbd nbi nbn nbo ncb ncc ncd nci ncn nco ndb ndc ndd ndi ndn ndo nib nic nid nii nin nio nnb nnc nni nnn nno no- nob noc nod noi non noo o-i ob- obb obc obd obi obn obo oc- ocb occ ocd oci ocn oco odb odc odd odi odn odo oib oic oid oii oin oio on- onb onc ond oni onn ono oo- oob ooc ood ooi oon ooo