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\put(5.05,1.52){$y=f(x)$}

\put(5.05,0.77){${}_{{}^{1}}$}
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\put(5.55,0.77){${}_{{}^{6}}$}

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\put(4.95,1.27){${}_{{}^{5}}$}
\put(4.95,1.37){${}_{{}^{6}}$}

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