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Thank you for your recent contribution to Kdenlive/Manual/Effects/Alpha manipulation/Blue Screen (among other pages). There was one problem with your edit, however, that I would like to draw your attention to: One of the translation unit tags was edited.
Please note, that the T tags (<!-- T:nn>) are automatically created by the translation system and used for internal book keeping only, so they should never be modified. They may be moved around (together with the associated paragraph) and you may modify the associated paragraph. If you want to add a new paragraph simply write it where you want it; when the translation system sees your new content it will create a T tag for it.