psi_cookbook.md: excerpt

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<!-- Copyright 2000-2022 JetBrains s.r.o. and other contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file. -->
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This page gives recipes for the most common operations for working with the PSI (Program Structure Interface).
Unlike [Developing Custom Language Plugins](custom_language_support.md), it talks about working with the PSI of existing languages (such as Java).
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> Please see also [Working with PSI efficiently](performance.md#working-with-psi-efficiently).
Unlike [Developing Custom Language Plugins](custom_language_support.md), it is about working with the PSI of existing languages (such as Java).
> Please see also [Working with PSI efficiently](performance.md#working-with-psi-efficiently).
>
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