(+2) – (+4)
(–2) – (–4)
(–2) – (+4)
(+2) + (–3)
(–3) – (–3)
(–3) + (–2)
-2 + 4
+2 – 3
–3 – 2
–3 + 3
+2 – 4
–2 – 4