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my $var;
BEGIN {
   $var = ...;
}

my $var = "some value";
...
code that uses $var
...

my $var = "some value";
BEGIN {
...
   code that uses $var
   ...
}

my $var;
BEGIN {
...
   code that uses $var
   ...
}

my $var; BEGIN { $var = "some value"; }

...
   code that uses for $var
   ...
}