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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def parse_value(val):
 """ Parse values from html """

    val = val.replace("%", " ")\
        .replace(" ","")\
        .replace(",", ".")\
        .replace("st","").strip()

    missing = ["Ejdeltagit", "N/A"]
    if val in missing:
        return val
    elif val == "":
        return None

    return float(val)