diff --git a/runtime.js b/runtime.js
index 396214b..2a20f53 100644
--- a/runtime.js
+++ b/runtime.js
@@ -43,6 +43,24 @@ var Primitives = (function() {
 	    var secondArg = MACHINE.env[MACHINE.env.length-2];
 	    return firstArg < secondArg;
 	},
+
+	'>': function(arity, returnLabel) {
+	    var firstArg = MACHINE.env[MACHINE.env.length-1];
+	    var secondArg = MACHINE.env[MACHINE.env.length-2];
+	    return firstArg > secondArg;
+	},
+
+	'<=': function(arity, returnLabel) {
+	    var firstArg = MACHINE.env[MACHINE.env.length-1];
+	    var secondArg = MACHINE.env[MACHINE.env.length-2];
+	    return firstArg <= secondArg;
+	},
+
+	'>=': function(arity, returnLabel) {
+	    var firstArg = MACHINE.env[MACHINE.env.length-1];
+	    var secondArg = MACHINE.env[MACHINE.env.length-2];
+	    return firstArg >= secondArg;
+	},
 	
 	'+': function(arity, returnLabel) {
 	    var firstArg = MACHINE.env[MACHINE.env.length-1];
@@ -100,10 +118,12 @@ var Primitives = (function() {
 	    var firstArg = MACHINE.env[MACHINE.env.length-1];
 	    return firstArg === NULL;
 	},
+
 	'add1': function(arity, returnLabel) {
 	    var firstArg = MACHINE.env[MACHINE.env.length-1];
 	    return firstArg + 1;
 	},
+
 	'sub1': function(arity, returnLabel) {
 	    var firstArg = MACHINE.env[MACHINE.env.length-1];
 	    return firstArg - 1;
diff --git a/test-browser-evaluate.rkt b/test-browser-evaluate.rkt
index 24d255a..404b4c6 100644
--- a/test-browser-evaluate.rkt
+++ b/test-browser-evaluate.rkt
@@ -63,4 +63,13 @@
               (displayln (fib 5))
               (displayln (fib 6)))
       "2\n3\n5\n8\n")
-      
\ No newline at end of file
+      
+
+(test '(begin (define (tak x y z)
+               (if (>= y x)
+                   z
+                   (tak (tak (- x 1) y z)
+                        (tak (- y 1) z x)
+                        (tak (- z 1) x y))))
+             (displayln (tak 18 12 6)))
+      "7\n")
\ No newline at end of file