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QUEST staircase CONDITIONS?

Hi guys, I am trying to make a QUEST staircase but I don’t understand what are the conditions I need to include in the excel file.
More specifically,what confuses me is stepSizes. Do I have to mention this parameter? I don’t see in the instructions that you have to mention the stepsizes, also it seems to me that even when I include them in the excel file they are not being used. How do you set the stepsizes for this type of staircase?