-ic bbb bbc bbi bbk bbo bbr bcb bcc bci bck bco bcr bcv bi- bib bic bii bik bio bir biv bkb bkc bkk bko bkr bkv bob boc boi bok boo bor bov brb bri brk bro brr brv bvb bvc bvi bvk bvo bvr bvv c-- cbb cbc cbi cbk cbo cbr cbv ccb ccc cci cck cco ccr ccv ci- cib cic cii cik cio cir civ ckb ckc cki cko co- cob coc coi cok coo cor cov crb crc cri crk cro crr crv cvb cvc cvi cvk cvo cvr cvv i-v ibb ibc ibi ibk ibo ibr ibv icb icc ici ick ico icr icv iib iic iii iio iir ikb ikc iki ikk iko ikr ikv io- iob ioc ioi ioo ior iov ir- irb irc iri irk iro irr irv ivb ivc ivi ivo ivr ivv kbb kbc kbi kbk kbo kbr kcb kcc kci kck kcr kib kic kii kik kio kir kiv kkb kkc kki kkk kkr kkv kob koc koi kok koo kor krc kri krk kro krr krv kvb kvi kvk kvo kvr kvv o-i ob- obb obc obi obk obo obr obv oc- ocb occ oci ock oco ocr ocv oib oic oii oik oio oir oiv okb okc oki okk oko okr oo- oob ooc ooi ook ooo oor oov or- orb orc ori ork oro orr orv ov- ovb ovc ovi ovo ovv rbb rbc rbi rbk rbo rbr rcb rcc rci rco rcr rcv rib ric rii rik rio rir riv rkb rkc rkk rko rkv rob roc roi rok roo ror rov rrb rrc rri rrk rrr rvb rvc rvi rvo rvr rvv vbc vbi vbk vbo vbr vbv vcc vci vco vcr vi- vib vic vii vik vio vir viv vkb vob voc voi vok voo vor vov vrb vrc vri vrk vrr vvb vvc vvi vvo vvr vvv