It should have been a = -1 and b = 2: I didn't read the diagram correctly.

14 - 1 - 4 = 9 which checks out.

The Z co-ordinate is 2 not -1.

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- February 2nd 2013, 12:30 AM #16

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- February 2nd 2013, 12:48 AM #17

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- February 2nd 2013, 12:49 AM #18

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