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Ron, Lou and Pedro

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Ron, Lou and Pedro are friends whose last names are: Shwarthorn, Parmesan and LaCucaracha.
They all go golfing on Sunday.
Ron spends exactly twice as much as Lou.
Lou spends exactly twice as much as Pedro.
Shwarthorn spends exactly $12.65 more than LaCucaracha.

Question: What is each man's full name?

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