This one has stuff defined out of order in a silly way so we can demonstrate segments.
Right now we're in the start segment. The <<hello>> thingy will request that we “include” the hello segment defined after:
<<Hello>> puts "World!"
This segment will actually run first because it's included at the beginning of the unnamed start segment above.
puts "Hello..."
This example is obviously nonsense. But it should demonstrate the principle nicely.