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    im on 5.50 Prome-4 Should I go 6.39 ProB7?

    Hello guys, I have been away for quite a while and im on 5.50 Prome 4. is it worthy going the step to 6.39 prob7? Whats the main difference between the two? what cant 5.50 do that 6.39 Prob7 can ? Thanks so much any help is appreciated.
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