-ic bbb bbc bbd bbi bbk bbn bbo bcb bcc bcd bci bck bcn bco bdb bdc bdd bdi bdk bdo bi- bib bic bid bii bik bin bio bkb bkc bkk bkn bko bnb bnc bnd bni bnk bnn bno bob boc bod boi bok bon boo c-- cbb cbc cbd cbi cbk cbn cbo ccb ccc ccd cci cck ccn cco cdb cdc cdd cdi cdk cdn cdo ci- cib cic cid cii cik cin cio ckb ckc ckd cki cko cn- cnb cnc cnd cni cnn cno co- cob coc cod coi cok con coo dbb dbc dbd dbi dbk dbn dbo dcb dcc dcd dci dck dcn dco ddb ddc ddd ddi ddk ddn ddo di- dib dic did dii dik din dio dkb dkc dki dkk dko dnb dnc dnd dni dnk dnn dno dob doc dod doi dok don doo i-d ibb ibc ibd ibi ibk ibn ibo icb icc icd ici ick icn ico idb idc idd idi idk idn ido iib iic iid iii iin iio ikb ikc iki ikk iko in- inb inc ind ini ink inn ino io- iob ioc iod ioi ion ioo kbb kbc kbd kbi kbk kbn kbo kcb kcc kcd kci kck kcn kdb kdc kdk kdo kib kic kid kii kik kin kio kkb kkc kki kkk kkn kn- knc knd kni knk knn kno kob koc kod koi kok kon koo n-i nbb nbc nbd nbi nbk nbn nbo ncb ncc ncd nci nck ncn nco ndb ndc ndd ndi ndk ndn ndo nib nic nid nii nik nin nio nkc nki nkk nkn nko nnb nnc nni nnk nnn nno no- nob noc nod noi nok non noo o-i ob- obb obc obd obi obk obn obo oc- ocb occ ocd oci ock ocn oco odb odc odd odi odn odo oib oic oid oii oik oin oio okb okc okd oki okk oko on- onb onc ond oni onk onn ono oo- oob ooc ood ooi ook oon ooo