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D = { -1 , 0 , 1 , 2 }
R = { -2 , 0 , 2 , 4 }
{ (-1,-2) , (0,0) , (1,2) , (2,4) }
2)
D = { 0 , 1 , 2 , 3 , 4 }
R = { -3 , -1 , 1 , 3 , 5 }
{ (0,-3) , (1,-1) , (2,1) , (3,3) , (4,5) }
3)
D = { 0 ≤ x ≤ 5 }
R = { 0 ≤ y ≤ 5 }