How can I restore my contacts?

I

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Contacts lost

I'm using 4s. I was replying back to one text and after that I switched to Facebook messenger and then again I got a text from the same contact i was replying to but this time there was no name with that contact. And when I checked the phonebook, most of my contacts were gone... I don't know what happened to them and I didn't do anything I swear. Please help me to restore my contacts back to my iPhone. And I'm also not sure if I backed up my contacts somewhere or not. Please please please help me.
 

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