A message update function specifically defined as {HEAD ~ part} of {TAIL ~ the invention}, is used to determine the outgoing message at the variable node, and the simple min operation along with modulo 2 sum of signs is used at the check node 
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A message update function specifically defined as { HEAD ~ part } of { TAIL ~ the invention } , is used to determine the outgoing message at the variable node , and the simple min operation along with modulo 2 sum of signs is used at the check node
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