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slope lacks direction
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slope lacks direction
approximating a curve
in square grid pattern
[Sometimes you find a haiku in the unlikeliest of places!]
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Whybish
Slope is direction
slope 2 = 2 squares forward one to the left
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I think you mean one to the right, phys ... and also that is the same slope as two backward and one to the left ... the opposite direction. 
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(2,1) and (-2,-1) have the same slope so would be indistinguishable
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