// Setup
var myArray = [[1,2,3], [4,5,6], [7,8,9], [[10,11,12], 13, 14]];
// Only change code below this line.
var myData = myArray[0][0];
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the arr[2] access the second element of the outer array arr[2] is an array, which contains the 8, the 8 is the second element, at index 1, so to get the 8 we need to do arr[2][1]