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arrayMystery12

Language/Type: JavaScript arrays array mystery

What are the values of the elements in array a1 after the following code executes? 

function arrayMystery12(a1, a2) {
    for (let i = 0; i < a1.length; i++) {
        a1[i] += a2[a2.length - i - 1];
    }
}

let a1 = [1, 3, 5, 7, 9];
let a2 = [1, 4, 9, 16, 25];
arrayMystery12(a1, a2);
a1[0]
a1[1]
a1[2]
a1[3]
a1[4]

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