Use a Parallel Node in conjunction with the qualifier to create an unbreakable matte selection! This is a great way to ensure that you never break your mattes and is something that I use in my node tree every day as a professional colourist.
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CHAPTERS
00:00 Introduction
00:13 Building A Node Tree
01:11 Pulling A Key
02:02 Serial Node Issues
02:48 Using Parallel Nodes
03:43 The Magic Trick