/usr/lib/s9fes/help/plus is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 11 12 | R4RS 6.5.5 (+ number1 ...) ==> number
(+) ==> number
(* number1 ...) ==> number
(*) ==> number
These procedures return the sum or product of their arguments.
(+ 3 4) ==> 7
(+ 3) ==> 3
(+) ==> 0
(* 4) ==> 4
(*) ==> 1
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