Access MultiDimensional Arrays With Indexes?

// 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];

What is the logic about this? I really can’t understand what is goin on here

Ok so I got it right by saying
// 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[1][2];
var myData = myArray[2] [1];

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