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It's a fun way of saying 1^2 + 5^2 + 6^2 = 2^2 + 3^2 + 7^2 and 9^2 + 5^2 + 4^2 = 8^2 + 7^2 + 3^2
It's a fun way of saying 1^2 + 5^2 + 6^2 = 2^2 + 3^2 + 7^2 and 9^2 + 5^2 + 4^2 = 8^2 + 7^2 + 3^2