true false question

Hi guys,

I have a data tree of true and false.

Is there some way to let them become true once there is true inside, otherwise is false?

(0)                                 (0)

true                                true

false                               (1)

(1)                                 true

false                               (2)

true        ----------->      false

(2)                                 (3)

false                               ........

false

(3)                                

......                             

Thanks!