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new gaps in practise tree

I am working my way down the tree but keep gets gaps showing in the ones I have already completed. I have never moved on without finishing a section so am disheartened to see these gaps appearing. I then have to go back and do another couple of parts. Anyone know what is happening?

August 29, 2013



It's all for your benefit. Gaps appear in places that you haven't covered in a while so that you stay familiar with the words you learn :)


They also appears when Duo adds some lesson to a skill.

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