How to hand-craft an edge into a Pluto's a computational graph?

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The core issue here is that modification have no deeper order. E.g.
Consider cells like:

# cell 1
x = Ref(2)

# cell 2
x[] = 5

# cell 3
@show x

Then it is clear that cell 1 must be executed first becuase it defines the variable x used in the other cells. But there is no unambigous order of cells 2 and 3.

You can introduce “auxiliary variables” to establish an order like:

# cell 1
x = Ref(2)

# cell 2
x[] = 5; aux=nothing;

# cell 3
aux; @show x
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