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package R;
package R::startR;

package R::startR;
...
@EXPORT_OK = qw(startR ...

$ cat pm_1152700_libs/R.pm
package R;
...
our @EXPORT_OK = qw{startR};
sub startR { print 'This is &R::startR' }
1;

$ cat pm_1152700_libs/R/startR.pm
package R::startR;
...
our @EXPORT_OK = qw{startR};
sub startR { print 'This is &R::startR::startR' }
1;

#!/usr/bin/env perl -l

...

R::startR();
R::startR::startR();

This is &R::startR
This is &R::startR::startR

use R qw{some_startR};
use R::startR qw{other_startR};

some_startR();
other_startR();