m

n

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a

b

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m: 6
n: 5
textfield1 = Textfield(m)
textfield2 = Textfield(n)
l1 = Sequence(Segment[(0, i), (m, i)], i, 0, n)
l2 = Sequence(Segment[(i, 0), (i, n)], i, 0, m)
A: (0, 0)
B: (6, 5)
D: (4, 3)
C: (2, 4)
a: 2
b: 4
textfield3 = Textfield(a)
textfield4 = Textfield(b)
t = Turtle()