Your test suite just checks whether a quadrilateral has equal sides, but that's not enough to form a square: rhombuses also have equal sides. Therefore, the test suite should also check a solution's angles.
PS: A test case filled with rhombuses and a single square on the curve would be instructional too.
Check if sorted
Arrange Vector in descending order
Valid Chess Moves
first step for Huffman Coding (easy)
Fix the last element of a cell array
Formatting currency numbers
Generate a melodic contour string matrix
MatCAT - Reconstruct X from Its X-rays
Put two time series onto the same time basis
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