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Given the predicate logic model

A = {a,b,c,d};
PM = {a,b}
QM = {(a,b), (b,b), (c,b)}
fM (a) = b, fM (b) = b, fM (c) = a, and fM (d) = c

the formula x Q(f(x),x) is satisfied in this model if, and only if, for all values of x the pair (fM(x),x) is in QM. To answer this, we simply compute all these pairs.
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