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Of course , I did not look at each single song in them myself ; but , on the whole , I believe that only songs which were sung by young people appeared in these books . We included only projects involving interventions purchasers could plausibly adopt ( payment strategies or public reporting of performance ) . An adversary not possessing the authentication key cannot generate the authenticator for fraudulent packets ; furthermore , since only packets that increase the sequence number are accepted ( or packets within the acceptable window ) , replay attacks are not feasible either . This should be just as true for the At Large Directors as it is for the Directors selected by the SOS , and will be more likely to be achieved if the At Large Directors do not feel that they are the only representatives of the user community . This can be visualized as choosing a mailbox slot that accepts only envelopes flying in certain orientations .