The example grammar TRANSITIVITY has nine systems but quite
a few gates (11) to put together the realisation statements.
It generates basic clause structures according to a network
approximately as given in Martin/Matthiessen/Painter (1997,
p158) "Working with Functional Grammar" (Edward Arnold).
Generation has to be done by hand, selecting features to
create structures which can then be inspected with the Graph
Structure command.  There is a set of 30 examples which show
the different kinds of structures that the grammar covers.
These examples are again drawn from
Martin/Matthiessen/Painter: the example are 'pregenerated'
and so can be used as a resource for looking at how
different structures are generated.  They will also be used
if the user asks for examples of any particular grammatical
feature from a graph of the network.

Note that because by default the gates are not shown in the
network graphs, it may not be clear immediately where the
constraints for the generated structures are coming from! 
