import math
def find_all_squares(n):
    squares = set()
    for i in range(1, int(math.sqrt(n)) + 1):
        a = i**2
        for j in range(i, int(math.sqrt(n)) + 1):
            b = j**2
            c = n - a - b
            if c >= 0 and c == int(c) and math.isqrt(c)**2 == c:
                squares.add(tuple(sorted([a, b, c])))
    if squares:
        return [list(sq) for sq in squares]
    else:
        return None

print(find_all_squares(51))