f(n) =\begin{Bmatrix}2n+1\ \ \ \ \ \mathrm{if}\ n>10, \\ 2n-2\ \ \ \ \ \ \mathrm{if} \ 0<n<10,
f(n) =\begin{Bmatrix}2n+1\ \ \ \ \ \mathrm{if}\ n>10, \\ 2n-2\ \ \ \ \ \ \mathrm{if} \ 0<n<10,
f(x) = \begin{cases}[br]x+2, \ x<-1 \\[br]x-1, \ x\geq -1[br]\end{cases}
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4 < n \leqg 6
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