Set up rules on the first text box with an action each that sets the value of
the second text box based on a condition (use the "Set Condition" button on
the "Rule" dialog box) of the value of the first text box falling within a
certain range. For a condition for each rule you can use two lines: The first
comparing the value of the first text box to a number using the "is greater
than or equal to" comparison AND the second comparing the value of the first
text box to a number using the "is less than or equal" comparison.
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S.Y.M. Wong-A-Ton