/usr/lib/s9fes/help/gcd is in scheme9 2010.11.13-2.
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1 2 3 4 5 6 7 8 9 10 | R4RS 6.5.5 (gcd integer1 ...) ==> integer
(lcm integer1 ...) ==> integer
These procedures return the greatest common divisor or least common
multiple of their arguments. The result is always non-negative.
(gcd 32 -36) ==> 4
(gcd) ==> 0
(lcm 32 -36) ==> 288
(lcm) ==> 1
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