How do I get my songs back from my mac back onto my iphone?

First off, I'll admit that I'm pretty ignorant about this sort of thing...I have an iphone, and have purchased quite a few songs for the ipod app on it, since i got the phone.

Well i did a sync between my iphone and my mac. Well, now all the songs are gone from my iphone/ipod, and they're on the mac in itunes in my purchased songs.

But i only ever purchased them with/for my iphone. Now they're all stuck on the mac and i can't figure out how to get them back onto my iphone. Is there any way I can do this? And what did I do wrong in the first place?

Thanks in advance for any help you can give.
 
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