Write method called sumEven that has two integer parameters num1 and num2, which represent a range of numbers. the method should find sum of all even numbers in the range including num1 and num2 and return the sum. The parameter num2 should be greater than or equal to num1 and both num1 and num2 should be greater than 0. If those condition are not satisfied return -1 from the method to indicate invalid.

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