source: [tag=","] [tag=PRP] □ □
destination: [tag=","] [tag=PRP] [□] □
spec: Standard parallel programming requires a programmer to anticipate these simultaneous activities and make sure that once a certain activity begins to access memory , it " locks " out other activities so they wait until the transaction is completed . Embodying that impulse the creature sets off into the north wastes in the novel 's last sentence - - not wearily or reluctantly , he " springs " from the ship . The real shame is that people have to make such a choice . Surprisingly , the identical nerves , in the same locations , are in female flies too .