$1$  

$D_f=\left\{-4,-2,0,5\right\}$  

$Y_f=\left\{0,1,3,7\right\}$  

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$2$  

$D_f=\left\{a,b,c,d\right\}$  

$Y_f=\left\{1,2\right\}$  

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$3$  

$D_f=\left\{0,\frac{1}{2},1,1\frac{1}{2},2\right\}$  

$Y_f=\left\{0,\frac{1}{2},1,1\frac{1}{2},2\right\}$  

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$4$  

$D_f=⟨-1,3⟩$  

$Y_f=⟨-1,3⟩$