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Android, using a Fragment to hold/edit complex object, accesible from any Activity

I'll do my best to describe the problem, but I'm still very new to several concepts that I think this problem requires to be solved (namely interfaces and threads). I should preface this by saying ...
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Object Constraint Language (OCL) for Stack in java.util package

I have an exam coming up and I'm looking at past papers to get some ideas of what to expect. I'm a bit stuck on the following one and would really appreciate if someone could give some example ...
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Notice that a slide is empty

I got a table of slides(objects) which are displaying 1-4 elements(objects) in that style: **** SLIDE 1 * Element 1 * Element 2 * Element 3 * Element 4 **** SLIDE 2 * Element 5 ...