diff --git a/Makefile b/Makefile
index 6d923eb..89af941 100644
--- a/Makefile
+++ b/Makefile
@@ -2,4 +2,6 @@ test :
 	node speci.js x-first
 	node speci.js y-first
 	node speci.js mixed
-	node speci.js randomized
+	node speci.js rand-suffix
+	node speci.js rand-prefix
+
diff --git a/readme.md b/readme.md
index 81dd0d4..d2c0880 100644
--- a/readme.md
+++ b/readme.md
@@ -9,44 +9,59 @@ handle a couple of different variants -- but this might not be true of all
 possibilities. 256 randomized variants is linearly slower.
 
 ```
- % node speci.js
-** x_first
+% make test
+node speci.js x-first
+** x-first
 run 1
-72 ms
+189 ms
 
 run 2
-15 ms
+293 ms
 
 run 3
-22 ms
+178 ms
 
-** y_first
+node speci.js y-first
+** y-first
 run 1
-73 ms
+196 ms
 
 run 2
-23 ms
+175 ms
 
 run 3
-20 ms
+174 ms
 
+node speci.js mixed
 ** mixed
 run 1
-2766 ms
+732 ms
 
 run 2
-52 ms
+716 ms
 
 run 3
-53 ms
+912 ms
 
-** randomized
+node speci.js rand-suffix
+** rand-suffix
 run 1
-464 ms
+15596 ms
 
 run 2
-445 ms
+15636 ms
 
 run 3
-445 ms
+15501 ms
+
+node speci.js rand-prefix
+** rand-prefix
+run 1
+18896 ms
+
+run 2
+18883 ms
+
+run 3
+18784 ms
 ```
diff --git a/speci.js b/speci.js
index 1fa6a6e..8cf3b0d 100644
--- a/speci.js
+++ b/speci.js
@@ -16,25 +16,23 @@ function doit(mode) {
         }
     }
 
-    function make_randomized(x, y) {
+    function make_rand_prefix(x, y) {
         let rando = (Math.random() * (2 ** 32 - 1)) | 0;
-        //let buckets = 256;
-        //random = rando % buckets;
         let r = 'random' + rando;
-        let o = {[r]: r};
-        if (Math.random() > 0.5) {
-            o.y = y;
-            o.x = x;
-        } else {
-            o.x = x;
-            o.y = y;
-        }
+        let o = {[r]: r, x, y};
+        return o;
+    }
+
+    function make_rand_suffix(x, y) {
+        let rando = (Math.random() * (2 ** 32 - 1)) | 0;
+        let r = 'random' + rando;
+        let o = {x, y, [r]: r};
         return o;
     }
 
     const million = 1000 * 1000;
     const n = 1 * million;
-    const runs = 1000 * n;
+    const runs = 100 * n;
 
     function bulk(filler) {
         let a = [];
@@ -48,7 +46,8 @@ function doit(mode) {
         'x-first': make_x_first,
         'y-first': make_y_first,
         'mixed': make_mixed,
-        'randomized': make_randomized,
+        'rand-prefix': make_rand_prefix,
+        'rand-suffix': make_rand_suffix,
     };
     let func = funcMap[mode];
     if (!func) {