Add 1^2+m^2, m^2+n^2, n^2+1^2, 21m+2mn+2nl
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1²+m² + m²+n² + n²+1² + 21m+2mn+2nl
= 2m² + 2n²+ 1² + 1² + 21m+2mn+2nl
= 2m²+2n²+2+21m+2mn+2nl
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