This is a mod for the game Factorio.
A player wanted global counters for number of bots in all networks.
This can be done with a custom combinator and a global scan of surfaces.
In this example, the combinator is producing the following values:
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N = "networks" = 2, the number of disconnected networks
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L = "logistic bots" = 56, matching sum(Y)
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M = "available logistic bots" = 55, matching sum(X)
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C = "construction bots" = 9, matching sum(T)
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D = "available construction bots" = 8, matching sum(Z)