Which one of the following could be a complete and accurate list of the friends who appear together in a photograph?

allbirdsarescooters on January 17 at 02:37AM

Diagramming

For the initial diagram, could someone elaborate on why we put an in and out for the y/r and w/s/u

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Emil-Kunkin on January 22 at 02:52PM

The RY rule tells us that one of them must always be in. If one is out, the other must be in. This means they cannot both be out, in other words, one must always be in.

We can apply the same logic to WSU. All three cannot be in, so at least one of the three must be out. This is a useful way of remembering that at least one must be in/out