Logic table filter. Enter the letters to use, enter a filter (valid JS which can use each letter as a variable, it will be 0 or 1), press "set". Example.
You can copy the current state, reduce it (removes dupe and red rows), remove columns (click on a header letter to remove entire column).
It's just a tool to compare logic formulas. © Peter van der Zee (Feb 2017), pvdz.ee