. We can derive the expression (78 (20 + 5)) 39 as follows (among many other derivations).

expr expr expr (expr) expr

(expr expr) expr (expr (expr )) expr (expr (expr + expr)) expr (expr (expr + expr )) number (expr (number + expr )) number (expr (number + expr)) 39 (expr (20 + expr)) 39 (expr (20 + number)) 39 (expr (20 + 5)) 39 (number (20 + 5)) 39 (78 (20 + 5)) 39,

Give the parse tree that represents this derivation. Lets call your parse tree P2.

Give the corresponding AST for P2. Lets call this AST A2.

If you pass A2 to some evaluator, what would be the final value?