diff --git a/index.js b/index.js
index ad07548..b3186f3 100644
--- a/index.js
+++ b/index.js
@@ -89,7 +89,7 @@ function convert2dPointToDistance (p, height) { // :: Int -> Int -> Int -> Int
         d += level * level * ((3 * xbit) ^ ybit)
         // rotate so that we'll be in sync with the next
         // region.
-        p = p.rotate2d(height, xbit, ybit)
+        p = p.rotate2d(level, xbit, ybit)
     }
 
     return d
@@ -165,8 +165,8 @@ function convertDistanceTo3dPoint (distance, height) { // Int -> Int -> [Int, In
 
 // Rotate the coordinate plane and (x,y)
 function rotate2d (n, x, y, xbit, ybit) { // :: Int -> Int -> Int -> Int -> Int -> [Int, Int]
-    if (ybit === 0  ) {
-        if (xbit === 1) {
+    if (ybit == 0  ) {
+        if (xbit == 1) {
             x = n - 1 - x
             y = n - 1 - y
         }
diff --git a/t/xy/2dto1d.t.js b/t/xy/2dto1d.t.js
index 090b892..2bbb7ea 100644
--- a/t/xy/2dto1d.t.js
+++ b/t/xy/2dto1d.t.js
@@ -1,7 +1,25 @@
 #!/usr/bin/env node
 
 require('proof')(1, function (equal) {
-  var hilbert = require('../..')
-
-  equal(hilbert.xy2d(16, 2, 2), 8)
+    var hilbert = require('../..')
+    equal(hilbert.xy2d(16, 2, 2), 8)
+    //equal(5, 8)
+    //hilbert.xy2d(0, 4, 2)
+    console.log("x: 0, y: 1, length: ", hilbert.xy2d(0, 1, 2)) // 1
+    console.log("x: 1, y: 1, length: ", hilbert.xy2d(1, 1, 2)) // 2
+    console.log("x: 1, y: 0, length: ", hilbert.xy2d(1, 0, 2)) // 3
+    console.log("x: 0, y: 2, length: ", hilbert.xy2d(0, 2, 2)) // 4
+    console.log("x: 0, y: 3, length: ", hilbert.xy2d(0, 3, 2)) // 5
+    console.log("x: 1, y: 3, length: ", hilbert.xy2d(1, 3, 2)) // 6
+    console.log("x: 1, y: 2, length: ", hilbert.xy2d(1, 2, 2)) // 7
+    console.log("x: 2, y: 2, length: ", hilbert.xy2d(2, 2, 2)) // 8
+    console.log("x: 2, y: 3, length: ", hilbert.xy2d(2, 3, 2)) // 9
+    console.log("x: 3, y: 3, length: ", hilbert.xy2d(3, 3, 2)) // 10
+    console.log("x: 3, y: 2, length: ", hilbert.xy2d(3, 2, 2)) // 11
+    console.log("x: 3, y: 1, length: ", hilbert.xy2d(3, 1, 2)) // 14
+    console.log("x: 2, y: 1, length: ", hilbert.xy2d(2, 1, 2)) // 13
+    console.log("x: 2, y: 0, length: ", hilbert.xy2d(2, 0, 2)) // 12
+    console.log("x: 3, y: 0, length: ", hilbert.xy2d(3, 0, 2)) // 15
+    hilbert.xy2d(3, 1, 2) // should be 12 showing up as 14
+    hilbert.xy2d(2, 0, 2) // should be 12 showing up as 14
 })