-ic bbb bbc bbf bbi bcb bcc bcf bci bcv bfb bfc bff bfi bfv bi- bib bic bif bii biv bvb bvc bvi bvv c-- cbb cbc cbf cbi cbv ccb ccc ccf cci ccv cfb cfc cff cfi cfv ci- cib cic cif cii civ cvb cvc cvf cvi cvv fbb fbc fbf fbi fcb fcc fcf fci fcv ffc fff ffi ffv fib fic fif fii fvc i-f i-v ibb ibc ibf ibi ibv icb icc icf ici icv ifb ifc iff ifi iib iic iif iii ivb ivc ivf ivi ivv vbc vbi vbv vcc vcf vci vfb vfc vff vfi vfv vi- vib vic vif vii viv vvb vvc vvi vvv