7. Write one ambiguous and one unambiguous grammar for nested if/else statements in Java or Python. It is acceptable to add braces to make the statements clear and easier to parse 8, write the minimal BNF expression for pure calculus with variable, abstraction and application (evaluation) Give 2 examples of A expressions with 3 variables and the identity function showing derivations to produce such input expressions. 7. Write one ambiguous and one unambiguous grammar for nested if/else statements in Java or Python. It is acceptable to add braces to make the statements clear and easier to parse 8, write the minimal BNF expression for pure calculus with variable, abstraction and application (evaluation) Give 2 examples of A expressions with 3 variables and the identity function showing derivations to produce such input expressions