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2) If no line is identified by the robot, the length of the returned line data is 2 while the value of the first and second items are
all 0.
19. Identified multi-line info
(1) Description: Obtain identified multi-line information. The parameters are n, X, Y, θ, and C.
(2) Type: Information block (list-type data)
(3) Example: Multi-line blink indication
When the robot identifies N lines, all the chassis LED indicators blink blue N times.
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