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#define SOH  0x01 
#define STX  0x02 
#define ETX  0x03 
#define EOT  0x04 
#define ACK  0x06 
#define BS   0x08 
#define LF   0x0a 
#define CR   0x0d 
#define XON  0x11 
#define XOFF 0x13 
#define NAK  0x15 
#define CAN  0x18 
#define CTLZ 0x1a 
#define ESC  0x1b 
#define SP   0x20 
#define DEL  0x7f