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Using R for purine and Y for pyrimidine, rewrite the short DNA sequence that appears below.
For example, "AATGC" would become "RRYRY". I have been forced to add this test as a simple spam filter.
CTTCGGAC 

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Dr. Michael Zuker
Department of Mathematical Sciences
Rensselaer Polytechnic Institute
zukerm@rpi.edu