_ Drag the points on the graph, and see what is going on:
First: (1,4) (1,6) (2,8) (4,9) (6,9) (8,8) (9,6) (9,4) (8,2) (6,1) (4,1) and join the points.
Second: (2,7) (4,7) (4,5) (2,5)
Third: (6,5) (8,5) (8,7) (6,7)
Fourth: (3,3) (4,2) (5,2) (6,2) (7,3)
Finally:
_ (1,5) (2,6)
_ (4,6) (6,6)
_ (8,6) (9,5)
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