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To refresh your memory about the arguments that a routine or function
takes, use the help command (help). It works on routines
and functions that are built into LUX and also on routines and functions
written by the user in the LUX language.
To figure out which routines and functions are built into your version
of LUX, use the show_subr and show_func commands
(show_subr, show_func).