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Jeremy Press wrote:Hi yupyup,
The reason we can create a definite Not-Law for H underneath Friday is that there are two basic options for every firefighter in the game: either they work on some day (maximum of two days) or they don't work on any day. If H does not work on any day, then clearly H cannot be scheduled on Friday. If H does work on some day (meaning if you put H anywhere on the line), then H has to be followed on the next day by G, which means H cannot be scheduled on Friday. That means there's no possible circumstance where H can be scheduled on Friday.
With the variables you mentioned, there are possibilities within the conditional logic that allow those variables to be scheduled for Friday. For example, F could be scheduled on Friday under the circumstance in which J does not work. For J and G, there are multiple options where scheduling on Friday is possible.
Notice, then, that it's not just the fact that a variable is included in a conditional rule that determines whether you can create Not-Laws for that variable. It's the broader issue of the possibilities that the conditional rule allows for that make such a determination possible.
I hope this helps!