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[tlaplus] Set within a set

I was wondering if it is possible to have a set within a set. I am looking for something like this:

cache = {{value1, valueIdx1, timestamp1}, {value2, valueIdx2, timestamp2} ... }

I tried to init cache using something like this:
cache = [ t \in 1..totalTime |-> {0, 0, 0} ]

The init works fine. But when I check for something like
cache[0]["value1"] < cache[1]["value1"]

I get an error saying applying function to a non function. 

Any help is appreciated. 

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