diff --git a/python/142/142.docx b/python/142/142.docx
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index 0000000..dcd0b86
Binary files /dev/null and b/python/142/142.docx differ
diff --git a/python/142/142.py b/python/142/142.py
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--- /dev/null
+++ b/python/142/142.py
@@ -0,0 +1,26 @@
+
+def m_add( x, y ):
+    return ( x + y ) % 4
+
+def m_sub( x, y ):
+    return ( x - y ) % 4
+
+def match( a, b, c, d, e, f ):
+    if m_add( a, b ) != m_add( c, d ):
+        return False
+    if m_sub( a, b ) != m_add( e, f ):
+        return False
+    if m_sub( c, d ) != m_sub( e, f ):
+        return False
+    return True
+
+for mask in range( 64 ):
+    a = ( mask & 32 ) >> 5
+    b = ( mask & 16 ) >> 4
+    c = ( mask & 8  ) >> 3
+    d = ( mask & 4  ) >> 2
+    e = ( mask & 2  ) >> 1
+    f = ( mask & 1  )
+    
+    if match( a, b, c, d, e, f ):
+        print( a, b, c, d, e, f )