diff --git a/arrays/src/arrays/Main.java b/arrays/src/arrays/Main.java
index 0925372..3959161 100644
--- a/arrays/src/arrays/Main.java
+++ b/arrays/src/arrays/Main.java
@@ -50,7 +50,15 @@ class Sudoku {
                 if (n < 1 || n > 9) return false;
 
         // Check that there'ren't any repeats in a row.
-        for (int[] row : puz) { int[] }
+        for (int[] row : puz) {
+            for (int n : row) {}
+        }
+
+        // Check that there'ren't any repeats in a column.
+
+        // Check that there'ren't any repeats in a 3x3 square.
+
+        return true;
     }
 }