[BUG] `if not 'text' in 'other text'` gives invalid expression error

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if not 'text' in 'other text'

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************** Exception Text **************
Assistant.Scripts.Engine.SyntaxError: Invalid expression
   at Assistant.Scripts.Engine.Lexer.Lex(String[] lines) in Razor.dll:token 0x6000a8b+0x75
   at Assistant.Scripts.ScriptManager.PlayScript(String[] lines) in Razor.dll:token 0x60009f7+0x5d

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