Collecting one out of a group of fields

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I have several places in an interview where I'm collecting several similar types of fields as multiple phone numbers.  The requirement is to put a field up for office phone, mobile phone, etc., and accept the input if at least one of the fields in completed. 

For this application, I'm just using the global entity.  It doesn't seems to make sense to complicate the setup with others.  I read Jasmine Lee's best practice guide

I created a rule that says:

the job site contact's phone information has been collected if

the job site contact office phone is known or