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void setup() {
  Serial.begin(9600);
  while (!Serial) {}  // wait for serial port to connect. Needed for native USB port only
  byte x = 0b10000000;  // the 0b prefix indicates a binary constant
  Serial.println(x, BIN); // 10000000
  bitWrite(x, 0, 1);  // write 1 to the least significant bit of x
  Serial.println(x, BIN); // 10000001
}

void loop() {}