def METHOD_NAME(self, x):
    """
    check whether given instance x exists in bit array
    Parameters
    ----------
    x
    Returns
    -------
    """
    hash_encoder = Hash(self.hash_method, False)
    for i in range(self.hash_func_count):
        ind = int(hash_encoder.compute(x, suffix_salt=self.salt[i]), 16) % self.bit_count
        if not self.query_bit(ind):
            return False
    return True