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Merge nodes deal with layering multiple images together.
Absminus
AddMix
Blend
ContactSheet
CopyBBox
CopyRectangle
Dissolve
In
Keymix
LayerContactSheet
Matte
Max
Merge
MergeExpression
Min
Multiply
Out
Plus
Premult
Screen
Switch
TimeDissolve
Unpremult
ZMerge