Syntax
where
The XBASE: command is used to delete the bases named as
arguments to the command. When a base is deleted, and if this base is
the name of a node defined via the GRID: command for influence
diagram use, then the node is deleted, and any arcs connecting this node
to any other are deleted. See §6.2 for details of
specifying collections for the definition part.
are the names of bases.
[, 
...] 