G21
G90

G0 X0 Y0

; Outer contour of F
G1 X5 Y0 F500
G1 X5 Y17.5
G1 X15 Y17.5
G1 X15 Y22.5
G1 X5 Y22.5
G1 X5 Y35
G1 X20 Y35
G1 X20 Y40
G1 X0 Y40
G1 X0 Y0

M30