Switch G1 (ID=19203)
The Yellow Toggle Switch
at the square marked
G1
reversez:
some of
the Two-Way Arrowz
in square
J1
.
the Two-Way Arrowz
in square
L11
.
the Two-Way Arrowz
in square
M10
.
the Two-Way Arrowz
in square
N9
.
some of the Two-Way Arrowz 
in square J1. the Two-Way Arrowz in square L11. the Two-Way Arrowz in square M10. the Two-Way Arrowz in square N9.
at the square marked G1 reversez: