Validate Survey Logic
From LimeSurvey Manual
Throughout development and testing of the survey, and before activating it, it is important to validate the survey logic. This is especially true starting in Version 1.92, where you can write complex relevance, tailoring, and validation equations, and need to be sure that nothing will break when you run the survey.
The Show Logic File feature of Version 1.92 helps you quickly, easily, and robustly perform these tasks.