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print variable name not by hash but ref?

some day i read a book telling that it may be useful to print a variable name for debugging purpose. since i was new that moment, i just skipped it. now when i want to use this feature, i no longer get back where it is. google search using perl and "print variable name" does not return good results. And I am not going to use hash because i just want to debug, e..g.

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