The last three changes in r, y, and pi are given next. What are the predicted values

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The last three changes in r, y, and pi are given next. What are the predicted values of the next set of changes in these series?
r y pi
-1.41 -0.019420 2.31
-0.48 0.015147 -1.01
0.66 0.003303 0.31
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