B2B lead gen via linkedin

My friend and I have 1,200 contacts in an excel CSV file. We have their first name last name and company information. We are trying to determine which of these contacts we have a shared connection with (our 2nd degree connection. We need you to search for each contact in a Sales Navigator account that we will provide to you. We need you to save all of the contacts who are identified as 2nd and 3rd degree connections into a list in Sales Navigator. 

You cannot use your own Sales Navigator account because you will get false positives for the 3rd degree connections.