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