What is the name of the pentalogy which features Dedication 3 and Dedication 4?
Dedication 4: Dedication 4 is a mixtape by Lil Wayne. Dedication 3:  It is the sequel to its predecessors, "The Dedication" and the highly successful "Dedication 2", becoming the third in Lil Wayne's "Gangsta Grillz" pentalogy.
Gangsta Grillz