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package Functions::Base;
use strict;
...
}

return 1;

package Functions::Alternate;
use strict;
...
}

return 1;

package Functions;
use strict;
...
our @ISA         = qw(Exporter);
our @EXPORT_OK   = (func1 func2 func3);
return 1;

use strict;
use Functions::Base qw(func1 func2 func3);
...
func2;
func3;
print "\n";

use strict;
use Functions::Alternate qw(func1 func2 func3);
...
func2;
func3;
print "\n";

use strict;
use Functions qw(func1 func2 func3);
...
func2;
func3;
print "\n";