Place the following events in the order they occur by listing their assigned letters in that order.

When formatting your answer, there should be no spaces or characters in between e.g. ABCDEF

A. Cas9 cuts both strands to generate a double strand break.
B. Cas9 unwinds dsDNA.
C. Cas9 complex scans dsDNA for PAM sequence.
D. Cas9 complex binds to dsDNA.
E. The programmable part of the guideRNA binds to its complementary sequence.
F. Cas9 REC domains binds to the guideRNA.