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To see all available qualifiers, see our documentation.
You can grasp how this works by watching stoic-lemon's video.
https://youtu.be/TYmAb8zOPWU?t=10m59s
https://youtu.be/TYmAb8zOPWU?t=14m2s
You can just ignore them, any keycode should be fine but KC_NO is preferable to indicate the key is not exist.