[O] org-drill: remove duplicates

[Dennis Yurichev]

Hi.

I just started using org-drill, which is seems pretty good.
One thing I noticed at first: are there a way to remove duplicates which 
will inevitably be added into the file?

And/or: it's possible to sort all entries in org-file by, let's say, "** 
English" heading?

I've something like...

======================================
* Word
** English
english word 2
** Russian
russian word 2

* Word
** English
english word 1
** Russian
russian word 1
======================================

It's possible to sort file so that's entry with "english word 1" 
will be at top?

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