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/usr/lib/s9fes/help/sys_usleep is in scheme9 2010.11.13-2.

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S9 EXT  (sys:sleep integer)   ==>  unspecific
        (sys:usleep integer)  ==>  unspecific

Suspend process execution for the given number of seconds (SYS:SLEEP)
or microseconds (SYS:USLEEP).

(sys:sleep 3)  ==>  unspecific