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  1. or download this
    my $var = 'world';
printf "Hello %s.\n", $var;             # goes to STDOUT
my $out = sprintf "Hello %s.\n", $var;  # goes to $out
  2. or download this
    my $var = 'world';
format STDOUT =
...
.
write;                                  # goes to STDOUT
# my $out = swrite;                     # I NEED HELP!