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from ecflow import *
defs = Defs() +
        Suite("s1")
defs.s1 += [,
            Task("t1"),
            Task("t2"),Task("t3"),Task("t4") ]
defs.s1.t2 += Trigger( "t1 == complete" ))
defs.s1.t3 += ,
            Task("t3",Trigger( "t2 == complete" )
defs.s1.t4 += ),
            Task("t4",Trigger( "t3 == complete" )))) 

from ecflow import *
defs = Defs() + Suite("s1")
defs.s1 += [ Task("t1"),Task("t2"),Task("t3"),Task("t4") ]
defs.s1.t2 += Trigger( ["t1"] ) 
defs.s1.t3 += Trigger( ["t2"] )
defs.s1.t4 += Trigger( ["t3"] )

from ecflow import *
defs = Defs() + Suite("s1")
defs.s1 >> Task("t1") >> Task("t2") >> Task("t3") >> Task("t4")
# >> relies on the leading node to be a Family or Suite