According to 'what', returns the number of nodes/variables for a
nom or an object comprising a slot
the bn/gn/dn/gn or nom object
-1: returns the number of nodes 0: returns the total number of variables i: returns the number of variables of the i-th node. (For convenience 'n' is translated as -1 and 'v' is translated as 0).
no check is performed.
The number of nodes or variables, accordingly to what
1 2 3
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