from typing import List


class Pos:
    def __init__(self, x: float = 0, y: float = 0):
        self.x_pos = x
        self.y_pos = y
        pass

    def make_copy(self) -> 'Pos':
        return Pos(self.x_pos, self.y_pos)


class Point:
    def __init__(self, name:str):
        self.point_name = name
        pass

    def name(self) -> str:
        return self.point_name

    def make_copy(self) -> 'Point':
        return Point(self.point_name)


class Line:
    def __init__(self, p0: Point, p1: Point):
        self.point_set = [p0, p1]
        pass

    def points(self) -> List[Point]:
        return self.point_set

    def make_copy(self) -> 'Line':
        return Line(self.points()[0].make_copy(), self.points()[1].make_copy())


class Arrow(Line):
    def __init__(self, start: Point, end: Point):
        Line.__init__(self, start, end)
        pass

    def start_point(self):
        return self.point_set[0]

    def end_point(self):
        return self.point_set[1]

    pass