// aux = rectangulo vazio (variavel auxiliar)
// newrec = criar rectangulo

If( r1.c > r2.c ):
	aux = r1
	r1 = r2
	r2 = aux


If( 		r2.a > r1.c
		or 	r2.c < r1.a
		or 	r2.d > r1.b
		or 	r2.b < r1.d
		):
		return None
else:
	newrec( max(r1.a, r2.a), max(r1.b, r2.b), min(r1.c, r2.c), min(r1.d, r2.d))