Deprecated control rig nodes

I’m creating a control rig for my character in 5.3 using the UE4 Mannequin control rig as a base because my character was rigged using the UE4 skeleton. However the UE4 control rig has several nodes that have been deprecated and I have no idea what the new versions were changed to. Cannot find the info on the documentation either. The nodes do not say what the new versions are and I have not gotten any error messages.

The nodes I need to replace are: “For Each Item (Deprecated)”, “Get Children (Deprecated)”, “Replace Items (Deprecated)”, and “Union (Deprecated)”

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Sequence node as well. Would be nice to know what to use instead.