-ic bbb bbc bbd bbi bbk bbo bbr bcb bcc bcd bci bck bco bcr bdb bdc bdd bdi bdk bdo bdr bi- bib bic bid bii bik bio bir bkb bkc bkk bko bkr bob boc bod boi bok boo bor brb brd bri brk bro brr c-- cbb cbc cbd cbi cbk cbo cbr ccb ccc ccd cci cck cco ccr cdb cdc cdd cdi cdk cdo cdr ci- cib cic cid cii cik cio cir ckb ckc ckd cki cko co- cob coc cod coi cok coo cor crb crc crd cri crk cro crr dbb dbc dbd dbi dbk dbo dbr dcb dcc dcd dci dck dco dcr ddb ddc ddd ddi ddk ddo ddr di- dib dic did dii dik dio dir dkb dkc dki dkk dko dkr dob doc dod doi dok doo dor drb drc drd dri drk dro drr i-d ibb ibc ibd ibi ibk ibo ibr icb icc icd ici ick ico icr idb idc idd idi idk ido idr iib iic iid iii iio iir ikb ikc iki ikk iko ikr io- iob ioc iod ioi ioo ior ir- irb irc ird iri irk iro irr kbb kbc kbd kbi kbk kbo kbr kcb kcc kcd kci kck kcr kdb kdc kdk kdo kdr kib kic kid kii kik kio kir kkb kkc kki kkk kkr kob koc kod koi kok koo kor krc krd kri krk kro krr o-i ob- obb obc obd obi obk obo obr oc- ocb occ ocd oci ock oco ocr odb odc odd odi odo odr oib oic oid oii oik oio oir okb okc okd oki okk oko okr oo- oob ooc ood ooi ook ooo oor or- orb orc ord ori ork oro orr rbb rbc rbd rbi rbk rbo rbr rcb rcc rcd rci rco rcr rdb rdc rdd rdi rdo rdr rib ric rid rii rik rio rir rkb rkc rkk rko rob roc rod roi rok roo ror rrb rrc rrd rri rrk rrr