-ic bbb bbc bbd bbi bbk bbn bbo bbr bcb bcc bcd bci bck bcn bco bcr bdb bdc bdd bdi bdk bdo bdr bi- bib bic bid bii bik bin bio bir bkb bkc bkk bkn bko bkr bnb bnc bnd bni bnk bnn bno bnr bob boc bod boi bok bon boo bor brb brd bri brk brn bro brr c-- cbb cbc cbd cbi cbk cbn cbo cbr ccb ccc ccd cci cck ccn cco ccr cdb cdc cdd cdi cdk cdn cdo cdr ci- cib cic cid cii cik cin cio cir ckb ckc ckd cki cko cn- cnb cnc cnd cni cnn cno cnr co- cob coc cod coi cok con coo cor crb crc crd cri crk crn cro crr dbb dbc dbd dbi dbk dbn dbo dbr dcb dcc dcd dci dck dcn dco dcr ddb ddc ddd ddi ddk ddn ddo ddr di- dib dic did dii dik din dio dir dkb dkc dki dkk dko dkr dnb dnc dnd dni dnk dnn dno dnr dob doc dod doi dok don doo dor drb drc drd dri drk drn dro drr i-d ibb ibc ibd ibi ibk ibn ibo ibr icb icc icd ici ick icn ico icr idb idc idd idi idk idn ido idr iib iic iid iii iin iio iir ikb ikc iki ikk iko ikr in- inb inc ind ini ink inn ino inr io- iob ioc iod ioi ion ioo ior ir- irb irc ird iri irk irn iro irr kbb kbc kbd kbi kbk kbn kbo kbr kcb kcc kcd kci kck kcn kcr kdb kdc kdk kdo kdr kib kic kid kii kik kin kio kir kkb kkc kki kkk kkn kkr kn- knc knd kni knk knn kno knr kob koc kod koi kok kon koo kor krc krd kri krk krn kro krr n-i nbb nbc nbd nbi nbk nbn nbo nbr ncb ncc ncd nci nck ncn nco ncr ndb ndc ndd ndi ndk ndn ndo ndr nib nic nid nii nik nin nio nir nkc nki nkk nkn nko nkr nnb nnc nni nnk nnn nno no- nob noc nod noi nok non noo nor nrb nrc nrd nri nrk nrn nro nrr o-i ob- obb obc obd obi obk obn obo obr oc- ocb occ ocd oci ock ocn oco ocr odb odc odd odi odn odo odr oib oic oid oii oik oin oio oir okb okc okd oki okk oko okr on- onb onc ond oni onk onn ono onr oo- oob ooc ood ooi ook oon ooo oor or- orb orc ord ori ork orn oro orr rbb rbc rbd rbi rbk rbn rbo rbr rcb rcc rcd rci rcn rco rcr rdb rdc rdd rdi rdn rdo rdr rib ric rid rii rik rin rio rir rkb rkc rkk rko rnb rnc rnd rni rnn rno rnr rob roc rod roi rok ron roo ror rrb rrc rrd rri rrk rrn rrr