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Let $K$ be the constant sheaf on $\mathbb P^{1}$ and $\mathcal O_{x}$ the structure sheaf.

Why can we say that $K/O_{x}$ is isomorphic to the direct sum of all the skyscraper sheaves $K/\mathcal O_{X,x}$ at $x$?

This is mentioned in passing at http://www.leuschke.org/uploads/SnowbirdTalks.pdf on page 127, and I can't figure it out.

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