add <number> to <user variable> e.g. add 2 to n3
There are 10 user variables of this type, and their values can be obtained by the normal expansion syntax (for example `$n3') in other commands. At the start of filtering, these variables all contain zero. Both arguments of the `add' command are expanded before use, making it possible to add variables to each other. Subtraction can be obtained by adding negative numbers.
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