From 4bb59df548b0e722556430393936abaa52849795 Mon Sep 17 00:00:00 2001
From: rsiddharth <s@ricketyspace.net>
Date: Sat, 22 Dec 2018 21:30:26 -0500
Subject: Add (net ricketyspace sicp two twentyone).

---
 net/ricketyspace/sicp/two/twentyone.scm | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 net/ricketyspace/sicp/two/twentyone.scm

diff --git a/net/ricketyspace/sicp/two/twentyone.scm b/net/ricketyspace/sicp/two/twentyone.scm
new file mode 100644
index 0000000..8ad559e
--- /dev/null
+++ b/net/ricketyspace/sicp/two/twentyone.scm
@@ -0,0 +1,14 @@
+;;;; License: CC0-1.0
+
+(define-module (net ricketyspace sicp two twentyone)
+  #:export (square-list-v1
+            square-list-v2))
+
+(define (square-list-v1 items)
+  (if (null? items)
+      items
+      (cons (* (car items) (car items))
+            (square-list-v1 (cdr items)))))
+
+(define (square-list-v2 items)
+  (map (lambda (x) (* x x)) items))
-- 
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