Should I file 3 different set of Form 843 and Form 8316 for 3 employers who withheld my FICA taxes during employment?

I am international student(F1 Visa) worked for 3 employers during my CPT and OPT and all the 3 have withheld FICA taxes during the employment time. I would like to claim those this year. I get information regarding filing for one employer but in my case I have 3 employers. Should I send all 3 different set (Form 843 and Form 8316) in one file to IRS or send 3 different set separately to IRS. 


Please assist!