Problem with App Syncing

10-11  Source: Network gathering  Views:0 

When I just recently synced my iPod, I unlock it to see that I am missing four applications from the springboard, one of them paid. I open up iTunes to see that the four apps are completely gone from both my iPod and iTunes.
Keeping in mind that this is the first sync with these four apps and the first time anything like this has happened, what can I do to get the paid app back?
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