T 180            #  We begin the path with an initial angle of 180 degrees 
A 250 288 L 200  # An arc of 250 cogs and 288 degrees and 
                 # a line of 200 cogs
A 250 288 L 200  # 5 times
A 250 288 L 200
A 250 288 L 200
A 250 288 L 200
X               # Center the path on the paper
W 0.2           # Pen with 0.2 points

D 125        # Disc of 125 cogs
H 120        # And hole 120
V 0 18 20    # Deviation of 0 degrees and increments of 18 degrees
             #        20 times
R 50         # Resolution 
N            # Count the number of cycles required close the disc's drawing 

C 255 0 0  > 0 0 255  10 # set the color Red -> Blue 10 values    
+ 0 0 255  > 255 0 0  10 # and then      Blue-> Red  10 values 

G 20

D -125       # now, set the Disc "inside" the path
H  120       # deviations changes sign

G 20