Known $f:\mathbb{N}_0 \to \mathbb{N}_0$ function for $\forall x,y\in \mathbb{N}_0$ the following terms are paid $(a). f(0,y)=y+1$ $(b). f(x+1,0)=f(x,1)$ $(c). f(x+1,y+1)=f(x,f(x+1,y)).$ Find the value if $f(4,1981)$
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Known $f:\mathbb{N}_0 \to \mathbb{N}_0$ function for $\forall x,y\in \mathbb{N}_0$ the following terms are paid $(a). f(0,y)=y+1$ $(b). f(x+1,0)=f(x,1)$ $(c). f(x+1,y+1)=f(x,f(x+1,y)).$ Find the value if $f(4,1981)$