I'm trying the draw a tree using the TikZ package, but I don't know how to draw a child node that has many parents. An example for that, is given by this picture
My problem is how to draw the level 3.
You can use two trees sitting on top of each other.
I'll leave the connection lines to you if you don't mind. You can access each node by first writing up the parent node name followed by a dash and the item number e.g.
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