[tlaplus] How to express this set comprehension in TLA+?

["hengx...@xxxxxxxxx" <hengxin0912@xxxxxxxxx>]

I want to express the following set comprehension (as a simplied example)

{<<x, y>> : x \in 1 .. 2, y \in 1 .. 2, y # x}

in TLA+ and expect the result {<<1, 2>>, <<2, 1>>}.

Note that the third condition "y # x" uses variable "x".

However, I got a parse error.

How should I correctly express it in TLA+?

Best regards,

hengxin

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