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    #!/usr/bin/perl 

...
$x = '$y';

print header(), start_html(), "\n";
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    package strictandwarnings;

...

1;
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    Global symbol "$x" requires explicit package name at ./tst100.pl line 
+9.
Global symbol "$x" requires explicit package name at ./tst100.pl line 
+11.
Execution of ./tst100.pl aborted due to compilation errors.
  4. or download this
    Use of uninitialized value in concatenation (.) or string at ./tst100.
+pl line 9.