def METHOD_NAME(m):
	((m00,m01,m02,m03),	
	 (m10,m11,m12,m13),	
	 (m20,m21,m22,m23),	
	 (m30,m31,m32,m33))= m
	a= m00 * mat3.METHOD_NAME(	((m11, m12, m13), 
						 (m21, m22, m23), 
						 (m31, m32, m33)) );
	b= m10 * mat3.METHOD_NAME(	((m01, m02, m03), 
						 (m21, m22, m23), 
						 (m31, m32, m33)) );
	c= m20 * mat3.METHOD_NAME(  ((m01, m02, m03), 
						 (m11, m12, m13), 
						 (m31, m32, m33)) );
	d= m30 * mat3.METHOD_NAME(	((m01, m02, m03), 
						 (m11, m12, m13), 
						 (m21, m22, m23)) );
	return a-b+c-d;