How to use ADF variables in C:when test?

I have a <af:iterator in my page fragment as follows
<af:iterator id="i1" value="#{queryModel.currentDescriptor.conjunctionCriterion.criterionList}" var="criterion" varStatus="vs">
Within this iterator, I want to make a decision absed on the index of the iterator. To do this test, I am using jstl as follows
<c:when test="${vs.index == '0' or vs.index == '2' or vs.index == '4'}">
This test is however always evaluating to false. I have tried cahnging my code using various combiantion as below ...
<c:when test="#{vs.index == '0' or vs.index == '2' or vs.index == '4'}">
<c:when test="${vs.index == 0 or vs.index == 2 or vs.index == 4}">
<c:when test="${vs.index == '0' || vs.index == '2' || vs.index == '4'}">
But nothign seems to be working fine.
Can some one help me with what I am doing wrong?
Thanks.

How to use ADF variables in <C:when test?

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