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. --> <!-- 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). 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). </p>
> 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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