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Testing mod-expt

We can use mod-expt to verify a signature: 
     > (= (mod-expt signature 3 modulus) message)
     #t
How about to sign a simple one-digit message? 
     > (mod-expt 7 signing-exponent modulus)
This will result in a stack overflow.

Q: What kind of repetition does mod-expt use?

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