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.
Irmologion Irmologion (Greek: τὸ εἱρμολόγιον "heirmologion") is a liturgical book of the Eastern Orthodox Church and those Eastern Catholic Churches which follow the Byzantine Rite. It contains irmoi (οἱ εἱρμοί) organised in sequences of odes (αἱ ᾠδαὶ, sg. ἡ ᾠδή)and such a sequence was called canon (ὁ κανών "law"). These canons of nine, eight, four or three odes are supposed to be chanted during the morning service (Orthros). The book Irmologion derives from "heirmos" (ὁ εἱρμός ) which means "link". The irmos is a melodic model which preceded the composition of the odes. According to the etymology, the book "collects" (λογεύω "logeuō") the irmoi.