-ic bbb bbc bbi bbo bbr bcb bcc bci bco bcr bcv bi- bib bic bii bio bir biv bob boc boi boo bor bov brb bri bro brr brv bvb bvc bvi bvo bvr bvv c-- cbb cbc cbi cbo cbr cbv ccb ccc cci cco ccr ccv ci- cib cic cii cio cir civ co- cob coc coi coo cor cov crb crc cri cro crr crv cvb cvc cvi cvo cvr cvv i-v ibb ibc ibi ibo ibr ibv icb icc ici ico icr icv iib iic iii iio iir io- iob ioc ioi ioo ior iov ir- irb irc iri iro irr irv ivb ivc ivi ivo ivr ivv o-i ob- obb obc obi obo obr obv oc- ocb occ oci oco ocr ocv oib oic oii oio oir oiv oo- oob ooc ooi ooo oor oov or- orb orc ori oro orr orv ov- ovb ovc ovi ovo ovv rbb rbc rbi rbo rbr rcb rcc rci rco rcr rcv rib ric rii rio rir riv rob roc roi roo ror rov rrb rrc rri rrr rvb rvc rvi rvo rvr rvv vbc vbi vbo vbr vbv vcc vci vco vcr vi- vib vic vii vio vir viv vob voc voi voo vor vov vrb vrc vri vrr vvb vvc vvi vvo vvr vvv