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  1. \item \ifassignmentsheet \points{3} \fi For the formula below, state one
  2. model that satisfies the formula, and one model that does not
  3. satisfy the formula.
  4. Explain your answer by drawing a syntax tree and evaluate your models with the help of this syntax tree.
  5. $$\forall x \exists y (P(f(x),y) \land \neg P(x,f(y)))$$