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Select Computed function from the Category list.
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Select a function from the Value list.
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Specify the arguments for the function by first clicking on an item from
the Value list and then clicking on the appropriate Arg button.
To create a new constant, select Constants, double-click on <constant> from
the Value list.
To create new arguments, click on the ... button next to the last Arg
button.
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Repeat the previous steps to create a computed field function.