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foo $x,$y,$z    means           foo($x,$y,$z)    For functions,
bar $x,$y,$z    doesn't mean    bar($x,$y,$z)       it depends on the 
+prototype.
...
chr $x,$y,$z    doesn't mean    chr($x,$y,$z)       it depends on the 
+prototype.
not $x+$y+$z    means           not($x+$y+$z)    For other operators,
!   $x+$y+$z    doesn't mean    !($x,$y,$z)         it depends on the 
+precedence.