def METHOD_NAME(self):
    self.sequences = self.inputs()
    first_element_1 = self.element_extract_first(self.sequences)
    last_element_1 = self.element_extract_last(self.sequences)
    first_element_2, last_element_2 = self.element_extract_first_last(self.sequences)
    return (first_element_1, last_element_1, first_element_2, last_element_2)