# Count Squares

Moderate

This problem is adapted from Count the Number of Squares at Wolfram Challenges, so you might want to first check out that page for illustrative visualizations of this problem.

Given a sequence of points (coordinates x, y as nonnegative integers), your function should count how many squares exist so that all four corners are members of points. Note that these squares are not required to be axis-aligned so that their sides would have to be either horizontal and vertical. For example, the points [0, 3], [3, 0], [6, 3], [3, 6] define a square, even if it may happen to look like a lozenge from our axis-aligned vantage point.

By the way, if your want to try another approach and count squares, having lines between points, The Square Chest awaits you!

Input: Array of tuples of two integers (number).

Output: Integer (number).

Examples:

```assert.strictEqual(
countSquares([
[0, 0],
[1, 0],
[0, 1],
[1, 1],
]),
1
);
assert.strictEqual(
countSquares([
[0, 0],
[1, 0],
[2, 0],
[0, 1],
[1, 1],
[2, 1],
[0, 2],
[1, 2],
[2, 2],
]),
6
);
assert.strictEqual(
countSquares([
[4, 3],
[1, 1],
[5, 3],
[2, 3],
[3, 2],
[3, 1],
[4, 2],
[2, 1],
[3, 3],
[1, 2],
[5, 2],
]),
3
);
```

The mission was taken from Python CCPS 109. It is taught for Ryerson Chang School of Continuing Education by Ilkka Kokkarinen

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