def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def serialize(self, value, display=False):
        lookup = {v: k for k, v in self.levels.items()}
        if value in lookup:
            return encode(lookup[value])
        return ""