II.S.0.0. Introduction GAP II.S.0.1. This is the book of the abbreviated version of The Guide for the Reader, known as The Book of Essential Requirements. II.S.0.2. Its author begins and says: You, may God support you, asked me to abbreviate for you The Book of Rules, which is generally known as The Guide for the Reader, in which I mention its essential requirements. So, I am here responding to this request of yours, asking God to grant me success in this, possibly including where necessary w...