I have table with head "End in" and values as "week 5", "week 8", etc.
"End in" Week included? or may be different depending on the context?
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In the example given, it means that you are to organize one drawer in your house each week for each of five weeks, starting with the first week and ending with the fifth.
At the conclusion of the fifth week, you will have organized five drawers in your house. So yes, the fifth week is included.
It's possible that there is some context in which the "end in" week was excluded, but I can't think of such a context, and I imagine it would be unlikely.