by ticker: generate record = prc[1] if _n == 1
by ticker: replace record = record[_n-1] if prc <= record[_n-1]
by ticker: replace record = prc if prc > record[_n-1]
by ticker: replace record = record[_n-1] if prc <= record[_n-1]
by ticker: replace record = prc if prc > record[_n-1]
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