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  1. or download this
    # Backend::A
package Backend::A;
sub foo { }
1;
  2. or download this
    # Backend::B
package Backend::B;
sub foo { }
1;
  3. or download this
    # main
my $backend = 'Backend::A';
...
$backend = 'Backend::B';
require $backend;
$backend->foo();