SAME-TAG : INFOSAME-TAG is a flag setting or other piece of information.
A setting for MT-SUBSUMPTION-CHECK.
Will check whether the tag of the mtree node about to be added (an integer
generated from the list of connections) is the same as any other existing tag,
and will reject it if it is. See TAG-CONN-FN and TAG-LIST-FN. (Note that most
tag functions can produce the same tag for different matings, so this may
reject connections unnecessarily.)
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