4. VCG Mechanism Consider the allocation of two indivisible objects, a an b to three agents, N = {1,2,3}, each of whom can consume a, b or even both {a, b}. Agent i values the consumption of a, b and {a, b} at vi, vi and vb, respectively. Her valuation profile (v, v, v). All that is publicly known is that for each player the valuations are non negative and v, vi v. Suppose the true valuations of the three players are as follows. For instance, if i = A then i = C.