At the bottom of each tutorial step, the is Solutions section, which list the files you should have come to if you have followed the instructions. The files in bold are the files that should have changed.

Table of Content

Step 1 - Interface Refactoring
Step 2 - Creating a Composite
Step 3 - Mixins
Step 4 - Concerns
Step 5 - Constraints
Step 6 - SideEffects
Step 7 - Properties
Step 8 - Generic Mixins
Step 9 - Private and Abstract Mixins

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