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That is a bit complicated,  but quite clever.  I'll try it and see how it works , and let you know.  

Thanks!  

Hello, everyone, I'm new to the forum, and I am excited to use FET for my grade school's scheduling needs.  

What I need is a way to make the following constraint:

If Activity1 comes first, then Activity2 can be consecutive
But, if Activity2 comes first,  then Activity1 must have at least 1 period in between.

For example, if the algorithm places Dance in 1st hour, then Wrestling can be placed in 2nd hour, but if Wrestling is placed in 1st hour, then Dance must be at least in 3rd hour, if not farther away.

A simpler, but less useful solution could be a constraint that says:

Activity1 and Activity2 will not be consecutive.  

Thank you for your help.