(This is test code for)
(the look-ahead algorithm)
G21
G90
G1 X5 F400
G1 X0
G1 X10 F200
G1 X20 F400
G1 X100 F1500
G1 X0
G1 Z1 F200
G1 X10 Y10 F200
G1 X20 Y20 F400
G1 X100 Y100 F1500
G1 X0 Y0
M2