5x5,,,3x3???

I don't understand your question. At the end of the 5x5 (after the first 4-5 weeks) you drop sets and reps down to 3 sets of 3 reps.
 
The first number of 5x5 represents the number of sets, the second number is how many reps per set.

Or, 5x5 just equals 25. :D
 
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