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[tlaplus] Re: Understand symmetric set

To be specific. For the example,

\* ...
variables x \in Foos, y \in Foos;
    print <<x, y>>;
end algorithm;

where Foos = {a, b} and declared symmetric.

Then only <<a, b>>, and <<a, a>> will be outputted.  but not <<b, b>>.

Why is that?

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