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How to assemble column content in jstl without all these when-tests?

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I have two HTML columns A and R where I need to display some combination of units (U), dollars (D) and occurrences (O). Column R must mimic the combination selected by A, but using its own data.

The rules are basically that I will display whatever is non-zero, or if everything is zero, I will display units (U) and dollars (D).

So, here is what I have for deciding what to put in column A:

so that the possible values for mode are:
0 -> units and dollars
1 -> units
3 -> dollars
4 -> units and dollars
5 -> occurrences
6 -> units and occurrences
8 -> dollars and occurrences
9 -> units, dollars, occurrences

Is there a better way to pick from these outcomes than doing something like this:

What is a better alternative? This also doesn't handle delimiting ${u1} from ${d1} and so on, so in reality it would be even more complex than shown here.
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Seems like something that would be better handled in the controller.
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