[scheduler]
    [[events]]
        expected task failures = 1/b, 1/c
[scheduling]
    [[graph]]
        R1 = """
            a | b? => c? & d
            c? | d => e
            b:failed? => !b
            c:failed? => !c
        """
[runtime]
    [[b,c]]
        script = false
    [[a,d, e]]
        script = true
