Add the following: l2 + m2, m2 + n2, n2 + l2, 2lm + 2mn + 2nl

Answer: 2l2 + 2m2 + 2n2 + 2lm + 2mn + 2nl

l2 + m2, m2 + n2, n2 + l2, 2lm + 2mn + 2nl

(l2 + m2) + (m2 + n2) + (n2 + l2) + (2lm + 2mn + 2nl)

(l2 + m2) + (m2 + n2) + (n2 + l2) + (2lm + 2mn + 2nl) = l2 + l2 + m2 + m2 + n2 + n2 + 2lm + 2mn + 2nl

(l2 + m2) + (m2 + n2) + (n2 + l2) + (2lm + 2mn + 2nl) = 2l2 + 2m2 + 2n2 + 2lm + 2mn + 2nl

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