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To do a lookup , we just walk down the tree letter-by-letter and then see if the node we get to at the end has a " $ " in it . As far as this forum is concerned , let 's just analyze if B-P thought does imply and require that Scouts should use Free Software ( the philosophy , more than any single " product " ) in principle , regardless of anything else . I do n't know if this incident really happened , but the fact that refugees wanted to tell me their story says a lot about what we need to do to make the UN accountable to the vulnerable people it is mandated to serve all over the world . We tested the code the came out of my reverse engineering against official test vectors , so I am confident that Alex and Adi 's caveat that the attack will only work if the A5 / 1 code is correct wo n't be an issue .