-ic bbb bbc bbd bbi bbk bbo bbr bcb bcc bcd bci bck bco bcr bcv bdb bdc bdd bdi bdk bdo bdr bdv bi- bib bic bid bii bik bio bir biv bkb bkc bkk bko bkr bkv bob boc bod boi bok boo bor bov brb brd bri brk bro brr brv bvb bvc bvd bvi bvk bvo bvr bvv c-- cbb cbc cbd cbi cbk cbo cbr cbv ccb ccc ccd cci cck cco ccr ccv cdb cdc cdd cdi cdk cdo cdr cdv ci- cib cic cid cii cik cio cir civ ckb ckc ckd cki cko co- cob coc cod coi cok coo cor cov crb crc crd cri crk cro crr crv cvb cvc cvd cvi cvk cvo cvr cvv dbb dbc dbd dbi dbk dbo dbr dbv dcb dcc dcd dci dck dco dcr dcv ddb ddc ddd ddi ddk ddo ddr di- dib dic did dii dik dio dir div dkb dkc dki dkk dko dkr dob doc dod doi dok doo dor dov drb drc drd dri drk dro drr drv dvb dvc dvd dvi dvk dvr i-d i-v ibb ibc ibd ibi ibk ibo ibr ibv icb icc icd ici ick ico icr icv idb idc idd idi idk ido idr idv iib iic iid iii iio iir ikb ikc iki ikk iko ikr ikv io- iob ioc iod ioi ioo ior iov ir- irb irc ird iri irk iro irr irv ivb ivc ivd ivi ivo ivr ivv 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 kiv kkb kkc kki kkk kkr kkv kob koc kod koi kok koo kor krc krd kri krk kro krr krv kvb kvi kvk kvo kvr kvv o-i ob- obb obc obd obi obk obo obr obv oc- ocb occ ocd oci ock oco ocr ocv odb odc odd odi odo odr odv oib oic oid oii oik oio oir oiv okb okc okd oki okk oko okr oo- oob ooc ood ooi ook ooo oor oov or- orb orc ord ori ork oro orr orv ov- ovb ovc ovd ovi ovo ovv rbb rbc rbd rbi rbk rbo rbr rcb rcc rcd rci rco rcr rcv rdb rdc rdd rdi rdo rdr rdv rib ric rid rii rik rio rir riv rkb rkc rkk rko rkv rob roc rod roi rok roo ror rov rrb rrc rrd rri rrk rrr rvb rvc rvd rvi rvo rvr rvv vbc vbd vbi vbk vbo vbr vbv vcc vcd vci vco vcr vdb vdc vdd vdi vdk vdo vdr vdv vi- vib vic vid vii vik vio vir viv vkb vob voc vod voi vok voo vor vov vrb vrc vrd vri vrk vrr vvb vvc vvi vvo vvr vvv