[R] How do I turn NA's to zeroes when a combination lacks one element?

[C_Crown]

Thank you so very much for your help. That worked perfectly. Yes, it's
homework, but hopefully what I'm learning with the homework I'll be able to
apply to my own research in the future, so I'd really like to learn the
program. And by the by, the "someone" was a classmate. Thanks again! 

Crystal

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