Since the designation of the direction of the magnetic dipole only follows a convention, the signs to the dipole are interchangeable:
Variant 1 and their summation:
+1,+1,+1 /+1 =4 +1,+1,-1 /-1 =0 +1,-1,-1 /+1 =0 +1,-1,+1 /-1 =0 -1,+1,+1 /-1 =0 -1,+1,-1 /+1 =0 -1,-1,-1 /-1 =-4 -1,-1,+1 /+1 =0
Variant 2 and their summation:
+1,+1,+1 /-1 =2 +1,+1,-1 /+1 =2 +1,-1,-1 /-1 =-2 +1,-1,+1 /+1 =2 -1,+1,+1 /+1 =2 -1,+1,-1 /-1 =-2 -1,-1,-1 /+1 =-2 -1,-1,+1 /-1 =-2