What is the name of the pentalogy which features Dedication 3 and Dedication 4?
Dedication 4 Dedication 4 is a mixtape by Lil Wayne. The mixtape was originally supposed to be released on August 15, 2012, but got pushed several times  and was released on September 3, 2012. It is the fourth installment of Lil Wayne's "Dedication" series, following its predecessors "The Dedication", "Dedication 2" and "Dedication 3". It's also the fourth installment of Lil Wayne's "Gangsta Grillz" pentalogy.
Prosimetrum A prosimetrum (plural prosimetra) is a poetic composition which exploits a combination of prose ("prosa") and verse ("metrum"); in particular, it is a text composed in alternating segments of prose and verse. It is widely found in Western and Eastern literature. While narrative "prosimetrum" may encompass at one extreme a prose story with occasional verse interspersed, and at the other, verse with occasional prose explanations, in true "prosimetrum" the two forms are represented in more equal measure. A distinction is sometimes drawn between texts in which verse is the dominant form and those in which prose dominates; there the terms "prosimetrum" and "versiprose" are applied respectively.