Royce da 5'9" and Fredro Starr of Onyx both describe Jay-Z's emphasis on flow in the book How to Rap—Starr says that Jay-Z is "a master of the flow—he can flow fast, he can flow slow".[121] The book describes how Jay-Z uses 'rests' to provide structure to a verse[122] and how he uses 'partial linking' to add more rhymes to a verse.[123] Jay-Z's early style is described by Vibe as "a distinctly Das EFX-type, stiggety style" on his 12" single "Can't Get With That",[124] referring to the fast rhythms and vocal delivery of the group Das EFX. He is also known to write lyrics in his head, as described by Pusha T of Clipse in How to Rap,[125] a style popular with many MCs such as The Notorious B.I.G.,[125] Everlast,[126] Bobby Creekwater[127] and Guerilla Black.[127] Shock G of Digital Underground describes Jay-Z's performance style, saying he "rarely breaks a sweat, and instead uses smoothness and clever wordplay to keep the audience interested and entertained".[128] Jay-Z's fast rapping technique, also known as the "triplet rhyme", was developed during his early years of creating music with former mentor Jaz-O.[129][130]