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If you want a block of text to appear untouched (i.e. does not respect wiki syntax), then enclose the text in triple curly brackets :

This text is verbatim. If we use special wiki syntax, it is NOT treated as wiki syntax.
So for example, using plus symbols will NOT make text bold.
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This is the wiki markup for the above :

If you just want to turn off wiki markup, but without creating a new block of text, then you should use the nowiki syntax instead.