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You can use a gray 180 degree servo to change position of the kayak on the blue river. It can go left or right using BBC Micro:bit and M_bit app on cell phone. Drill a 5 .0 mm round hole in any creation and use an axle connected to the motor then use a power expansion board like Superbit or Robotbit and the above code link into the Micro:bit for control with any mobile device, Apple or Android.

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