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  1. or download this
    -----------
    package Baz;
    use base qw(Foo Bar);
  2. or download this
        BEGIN {
    require Foo;
    require Bar;
    push @ISA, qw(Foo Bar);
    }
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  3. or download this
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### File A.pm
package A;
...
@ISA = qw(A);
sub import { warn "Z imported"; }
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  4. or download this
    bash$ perl -e 'use X'
import X at X.pm line 7.

...
bash$ perl -e 'use Z'
import A at A.pm line 5.
import Z at Z.pm line 9.