1. Find the angles between all pairs of vectors from the following set. Which ones correlate positively and which negatively?
   A = (1, 2, -3), B = (1,2,3), C = (1,1,1)
2. Data files can be considered vectors, usually with dimension too big to visualize. Do the following data correlate positively or negatively? What is the "angle" between them?
   D = (-2, 0 , 1, -1, 2),      E = (2, 2, 0, -1, -1).

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