T 180 # We begin the path with an initial angle of 180 degrees
# Path 7 times [arc radius=210, angle= 360(1-1/7) degrees
# and seven segments of length 200 ]

A 210 308.57142857142857142960 L 200
A 210 308.57142857142857142960 L 200
A 210 308.57142857142857142960 L 200
A 210 308.57142857142857142960 L 200
A 210 308.57142857142857142960 L 200
A 210 308.57142857142857142960 L 200
A 210 308.57142857142857142960 L 200

X # Center the path on the paper
W 0.1 # Pen with 0.1 points

D 105 # Disc of 105 cogs
H 0 > 105 9# And hole 105
V 0 > 72 9 # Deviation from 0 degrees to 72
# and increments of 9 degrees

R 50 # Resolution
N # Count the number of cycles
# required to close the disc's drawing

C 255 0 0 > 0 0 255 4 # set the color Red -> Blue 4 values
+ 0 0 255 > 255 0 0 4 # and then Blue-> Red 4 values

G 8

D -105# now, set the Disc "inside" the path
H 0 > 105 9 # deviations changes sign

G 8

# Peace and love, brothers.