bbb bbe bbf bbi be- beb bee bef bei bev bfb bfe bff bfi bfv bi- bib bie bif bii biv bvb bve bvi bvv ebb ebe ebf ebi ebv eeb eee eef eev ef- efb efe eff efi eib eie eif eii eiv evb eve evf evi evv fbb fbe fbf fbi feb fee fef fei fev ffe fff ffi ffv fib fie fif fii i-f i-v ibb ibe ibf ibi ibv ie- iee ief iei iev ifb ife iff ifi iib iie iif iii ivb ive ivf ivi ivv v-e vbi vbv veb vee vef vei vfb vff vfi vfv vi- vib vie vif vii viv vvb vvi vvv