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Table of Contents

Case II.

$6 a^{2} + 2 a b - 3 a c - b c$ .

$a b x y + c x y + a b c + c^{2}$ .

$a x - a y - b x + c y - c x + b y$ .

$(a - b)^{2} - 2 c (a - b)$ .

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