did some quick work on a few problems in section 4. Mostly pushing ju…

…st to make transfering work easier to computer at home

clojure/section4.3/src/ex4_35.clj

@@ -0,0 +1,7 @@
+(ns ex4-35)
+
+(defn an-integer-between [n z]
+  (if (> n z)
+    (amb)
+    (amb n (an-integer-between (inc n) z))))
+

clojure/section4.3/src/ex4_47.clj

@@ -0,0 +1,11 @@
+(ns ex4-37)
+
+; My initial reaction is that Ben Bitdiddle's change
+; does improve the efficiency.
+
+; It seems to me that because the first 'require check is
+; done earlier (only after i and j have been picked, k is still
+; unpicked) that the work of chosing a k will not always be done.
+; Not doing the work to pick k would cut down on the number of
+; possibilities that need to be checked and hence cause an efficiency
+; gain