From 48db6d5b09eaf052c6f39efe32bb79830bcb3938 Mon Sep 17 00:00:00 2001
From: Justin Ethier <justin.ethier@gmail.com>
Date: Fri, 30 Sep 2016 01:38:57 -0400
Subject: [PATCH] WIP

---
 docs/api/primitives.md |  4 ++
 docs/api/scheme/cxr.md | 84 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 docs/api/scheme/cxr.md

diff --git a/docs/api/primitives.md b/docs/api/primitives.md
index f130c382..202792c0 100644
--- a/docs/api/primitives.md
+++ b/docs/api/primitives.md
@@ -30,7 +30,11 @@ bytevector-length
 bytevector-u8-ref
 bytevector-u8-set!
 bytevector?
+caar
+cadr
 car
+cdar
+cddr
 cdr
 cell
 cell-get
diff --git a/docs/api/scheme/cxr.md b/docs/api/scheme/cxr.md
new file mode 100644
index 00000000..d23d1beb
--- /dev/null
+++ b/docs/api/scheme/cxr.md
@@ -0,0 +1,84 @@
+# CxR Library
+
+The `(scheme cxr)` library exports twenty-four procedures which are the compositions of from three to four `car` and `cdr` operations. For example `caddar` is defined by:
+
+    (define caddar
+      (lambda (x) (car (cdr (cdr (car x))))))
+
+The procedures `car` and `cdr` themselves and the four two-level compositions are included in the base library.
+
+For more information see the [R<sup>7</sup>RS Scheme Specification](../../r7rs.pdf).
+
+- [`caaar`](#caaar)
+- [`caadr`](#caadr)
+- [`cadar`](#cadar)
+- [`caddr`](#caddr)
+- [`cdaar`](#cdaar)
+- [`cdadr`](#cdadr)
+- [`cddar`](#cddar)
+- [`cdddr`](#cdddr)
+- [`caaaar`](#caaaar)
+- [`caaadr`](#caaadr)
+- [`caadar`](#caadar)
+- [`caaddr`](#caaddr)
+- [`cadaar`](#cadaar)
+- [`cadadr`](#cadadr)
+- [`caddar`](#caddar)
+- [`cadddr`](#cadddr)
+- [`cdaaar`](#cdaaar)
+- [`cdaadr`](#cdaadr)
+- [`cdadar`](#cdadar)
+- [`cdaddr`](#cdaddr)
+- [`cddaar`](#cddaar)
+- [`cddadr`](#cddadr)
+- [`cdddar`](#cdddar)
+- [`cddddr`](#cddddr)
+
+#caaar
+    (caaar list)
+#caadr
+    (caadr list)
+#cadar
+    (cadar list)
+#caddr
+    (caddr list)
+#cdaar
+    (cdaar list)
+#cdadr
+    (cdadr list)
+#cddar
+    (cddar list)
+#cdddr
+    (cdddr list)
+#caaaar
+    (caaaar list)
+#caaadr
+    (caaadr list)
+#caadar
+    (caadar list)
+#caaddr
+    (caaddr list)
+#cadaar
+    (cadaar list)
+#cadadr
+    (cadadr list)
+#caddar
+    (caddar list)
+#cadddr
+    (cadddr list)
+#cdaaar
+    (cdaaar list)
+#cdaadr
+    (cdaadr list)
+#cdadar
+    (cdadar list)
+#cdaddr
+    (cdaddr list)
+#cddaar
+    (cddaar list)
+#cddadr
+    (cddadr list)
+#cdddar
+    (cdddar list)
+#cddddr
+    (cddddr list)