SYMBOL FOR ESCAPE
SYMBOL FOR NULL
SYMBOL FOR START OF HEADING
SYMBOL FOR END OF TRANSMISSION
SYMBOL FOR ENQUIRY
SYMBOL FOR BACKSPACE
SYMBOL FOR SHIFT IN
SYMBOL FOR DEVICE CONTROL ONE
SYMBOL FOR DEVICE CONTROL THREE
SYMBOL FOR NEGATIVE ACKNOWLEDGE
SYMBOL FOR SYNCHRONOUS IDLE
SYMBOL FOR END OF TRANSMISSION BLOCK
SYMBOL FOR CANCEL
SYMBOL FOR SUBSTITUTE
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