As seen in the last column the blank will contain the biconditional symbol.
inverse: if then
contrapositive: if then
inverse: If I don't have a car, then I cannot drive
contrapositive: If I cannot drive, then I do not have a car.
inverse: If the square of an integer is not even, then the integer is not even.
contrapositive: If an integer is not even, then the square of the integer is not even.
The last column in the above two tables are equal.