As stated above, the only solution I see is two array questions with an exclusion filter on the second question so the option selected in Q1 is hidden in Q2. You can place maximum and minimum answer settings to enforce a single answer in each array.
Cheers,
Tony Partner Solutions, code and workarounds presented in these forums are given without any warranty, implied or otherwise.
Is anyone willing to help us accomplish this? I have some programming background, but have not trained myself on PHP or Java. We will compensate whoever can help!