-ic bbb bbc bbd bbi bbn bbo bbs bcb bcc bcd bci bcn bco bcs bdb bdc bdd bdi bdo bds bi- bib bic bid bii bin bio bis bnb bnc bnd bni bnn bno bns bob boc bod boi bon boo bos bsb bsc bsd bsi bsn bso bss c-- cbb cbc cbd cbi cbn cbo cbs ccb ccc ccd cci ccn cco ccs cdb cdc cdd cdi cdn cdo cds ci- cib cic cid cii cin cio cis cn- cnb cnc cnd cni cnn cno cns co- cob coc cod coi con coo cos csb csc csd csi csn cso css dbb dbc dbd dbi dbn dbo dbs dcb dcc dcd dci dcn dco dcs ddb ddc ddd ddi ddn ddo dds di- dib dic did dii din dio dis dnb dnc dnd dni dnn dno dns dob doc dod doi don doo dos dsb dsc dsd dsi dsn dso dss i-d ibb ibc ibd ibi ibn ibo ibs icb icc icd ici icn ico ics idb idc idd idi idn ido ids iib iic iid iii iin iio iis in- inb inc ind ini inn ino ins io- iob ioc iod ioi ion ioo ios is- isb isc isd isi isn iso iss n-i nbb nbc nbd nbi nbn nbo nbs ncb ncc ncd nci ncn nco ncs ndb ndc ndd ndi ndn ndo nds nib nic nid nii nin nio nis nnb nnc nni nnn nno nns no- nob noc nod noi non noo nos nsb nsc nsd nsi nsn nso nss o-i ob- obb obc obd obi obn obo obs oc- ocb occ ocd oci ocn oco ocs odb odc odd odi odn odo ods oib oic oid oii oin oio ois on- onb onc ond oni onn ono ons oo- oob ooc ood ooi oon ooo oos os- osb osc osd osi osn oso oss sbb sbc sbd sbi sbn sbo sbs scb scc scd sci scn sco scs sdb sdc sdd sdi sdn sdo sds sib sic sid sii sin sio sis snb snc snd sni snn sno sns sob soc sod soi son soo sos ss- ssb ssc ssd ssi ssn sso sss