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// define the pins used controlling 74HC595
#define DATA_PIN 2
#define CLOCK_PIN 3
#define LATCH_PIN 4
// define the order of 74HC595 chain
#define CHIP_0 0
#define CHIP_1 1
#define CHIP_2 3
#define CHIP_3 5
#define CHIP_4 7
#define CHIP_5 8
#define CHIP_6 6
#define CHIP_7 4
#define CHIP_8 2
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