n = 4 (slider from 1 to 20, step 1)
集合1 = Sequence(Segment[(0.0, i), (n, i)], i, 0.0, 2.0)
集合2 = Sequence(Segment[(i, 0.0), (i, 2.0)], i, 0.0, n)
集合3 = Sequence((i, 2.0), i, 0.0, n)
集合4 = Sequence((i, 1.0), i, 0.0, n)
集合5 = Sequence((i, 0.0), i, 0.0, n)