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The Parallelogram Rule:
Given two vectors, c and d, not equal to each other:
1. Place the initial points of both vectors in the same point and call it point O.
2. Draw a line parallel to vector c at the endpoint of vector d and also draw a line parallel to vector d at the endpoint of vector c, name the point of intersection of the parallel lines, call it point B.
3. `OB is the vector sum of vector c and vector d.
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