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- towardsxy --Operation, two inputs.
- This operation applies only to the display turtle. The two inputs
- must be numbers, which are the x and y coordinates of a point on the
- TV screen. The output is a number which is the heading to which the
- turtle must be set, in order to point towards that point from its
- current position. Note: this operation does not actually move or turn
- the turtle. You must use it as the input to setheading if that is
- what you want.
-