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   UBRR0 = 103; // for configuring baud rate of 9600bps
   UCSR0C |= (1 << UCSZ01) | (1 << UCSZ00); 
// Use 8-bit character sizes
   UCSR0B |= (1 << RXEN0) | (1 << TXEN0) | (1 << RXCIE0);  
// Turn on the transmission, reception, and Receive interrupt     
   sei();// enable global interrupt