tut   enea   diku   unido   hafro   	tut -> Finland
             |      \     |     /	  |		enea -> Sweden
             |       \    |    /	  |		diku -> Denmark
             |        \   |   /		  |		unido -> W. Germany
             |         \  |  /		  |		inria -> France
    inria----+----------mcvax-------------+       	mcvax -> Netherlands
             |         /  |  \	          |		cernvax -> Switzerland
             |        /   |   \	          |		ukc -> Great Britain
             |       /    |    \          |		prlb2 -> Belgium
             |      /     |     \         |		i2unix -> Italy
	   tuvie  ukc    prlb2   i2unix  cernvax	tuvie -> Austria
							hafro -> Iceland