1) + =
2) - =
3) + =
4) - =
5) - = - =
6) + = + =
7) + = =
8) - = - =
9) = - =
10) =
11) = =
12) = = =
1)
+
= 
2)
-
= 
3)
+
= 
4)
-
= 
5)
-
=
-
= 
6)
+
=
+
= 
7)
+
=
= 
8)
-
=
-
= 
9)
=
-
= 
10)
= 
11)
=
= 
12)
=
=
= 