Construct derivations that establish the following derivability claims. In each case start by setting up the main structure of the derivationwith the primary assumption or assumptions at the top and the sentence to be derived at the bottom, and then identify the initial subgoal or goals. Complete the derivation, remembering to consider both the form of the current goal sentence and the content of the accessible sentences in selecting appropriate subgoals.

{(F G) (H & I)} | ~ F H