Keyestudio KS4028 Manual page 124

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Make combinations of these blocks:
(5)Test Result 1:
After uploading test code to micro:bit main board and powering the main
board via the USB cable, the 5*5 LED dot matrix shows A if button A is
pressed and then released, B if button B pressed and released, and AB if
button A and B pressed together and then released.
(6)Test Code 2:
The route to get test codes（How to load?）
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