Add L^2 + M^2 + M^2 + N^2 + N^2 +L^2 + 2LM + 2MN + 2NL
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2L² + 2M² + 2N² + 2LM + 2MN + 2NL = L² + M² + 2LM + L² + N² + 2NL + M² + N² + 2MN = (L+M)² + (L+N)² + (M+N)²
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