Keywords: class-associated-arrays

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## Pre-reserved array names

The names `X, Y, C, V, F, I, T` and `A` are pre-reserved because they refer to the `RX` or `RY` arrays in the different possible units in CLASS (command `SET UNIT`). The use of these names is restricted in order to avoid confusion. In the future they could also be used as real arrays saved on disk.