This subsection describes some of the procedures and special forms that are present in Pixie Scheme, that are not part of the R3 standard. I have not described all such extras: If you explore the system with the various lowΓÇôlevel inspection tools described herein, you will find procedures I do not mention. I am not trying to keep secrets: Rather, I have described only those enhancements that seem stable enough to use in your own code. The