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|   ToggleSneak v3.2.3 for Minecraft v1.9    |
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What you need to run ToggleSneak:

    1) Minecraft Forge for Minecraft 1.9 - Build 1887 or newer
    2) PlayerAPI Core v1.0 for Minecraft Forge 1.9



If you don't already have Minecraft Forge installed, go to the Download 
page at http://files.minecraftforge.net/ and look on the top part of the 
page for the 'Recommended' build for Minecraft 1.9.  