TWO of these # 1/10?

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Here's what says:
2009 SP Authentic By The Letter Signatures #RB Ryan Braun/ 90 */ Letters spell Ryan Braun (each letter #'d/ 10) AU, S#
Print Run/10
I imagine there are 10 of each letter. Just a guess though.

That's the deal.

My question is............. Are there 20 R's, 20 N's and 20 A's, 10 with one card number on the back and 10 with another ?