Create complex multi-dimensional arrays [Berlin]

Tell us what’s happening:
why this error?
myNestedArray should contain exactly one occurrence of the string “deep” on an array nested 3 levels deep

Your code so far


let myNestedArray = [
  // change code below this line
  ['unshift', false, 1, 2, 3, 'complex', 'nested'],
  ['loop', 'shift', 6, 7, 1000, 'method'],
  [
    [
  ['deep'],
  ['deeper'],
  [['deepest']]
    ]
  ]
  // change code above this line
];

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Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-data-structures/create-complex-multi-dimensional-arrays

Here is the hint in more detail:
three levels deep [[[ ]]]
four levels deep [[[[ ]]]]
five levels deep [[[[[ ]]]]]
So, in an array it will look like this

[
  [[ ]],         // three levels deep
  [[[ ]]],       // four levels deep
  [[[[ ]]]],     // five levels deep
]