x
P0
P0
P1
P1
P0
P0
P1
P1
1
2 2 8 8
x+1
P0
P1
x-1
P0
P1
P0
P1
1
2 2 6 6
1
x1
x2
2 2 3 3
x
P0
P1
2 2 4 4
P0
P1
P1=3
2 2 5 5
x1
2 2 9 9
3 3 1 1
PATENTS AND DESIGN PATENTS PENDING FOR SOME COUNTRIES (e.g. : US)
P0
x+1
P1
P0
P1
P0
x-1
P1
P0
P1
2 2 7 7
3 3 0 0
+
+
2s max.