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or can simply use the property: (a+b+c+d....)^2 - (a^2 + b^2 + c^2 + d^2 ....) = 2(a*b + b*c + b*d + a*c + )
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Journey to the Moon
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or can simply use the property: (a+b+c+d....)^2 - (a^2 + b^2 + c^2 + d^2 ....) = 2(a*b + b*c + b*d + a*c + )