Open the Align and Distribute palette by choosing Arrange | Align and Distribute | Align and Distribute from the drop-down menu at the top of the screen.
Select all the boxes in one column. In the Distribute tab of the Align and Distribute palette click the box next to Center Vertically, then click Apply. (Shortcut: Shift + A).
Repeat this step for each column until each box in the jig is aligned with its row and column.

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