According to 'what', returns the names of nodes/variables for
the object to consider
-2: returns all names of the variables (without the node name) -1: returns the names of the nodes 0: returns all names of the variables (including the node name) i: returns the names of the variables of the i-th node. (For convenience 'n' is translated as -1 and 'v' is translated as 0).
As it is a very basic function, no check is made about the arguments.
The names of nodes or variables, accordingly to
1 2 3 4
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