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The Security Council has primary responsibility, under the United Nations Charter, for the maintenance of international peace and security. It is for the Security Council to determine when and where a UN peace operation should be deployed.
What did the planes have in common? they were all domestic flights heading towards the West coast, which means that they would have a great amount of fuel on them: this would increase the explosion and fire after the crashes. This was a likely reason for those and not other planes being chosen.
ST + TU = SU, because 36 + 64 = 100 (ST)2 + (TU)2 = (SU)2, because 102 + 62 = 82 ST + TU = SU, because 102 + 62 = 82 (ST)2 + (TU)2 = (SU)2, because 36 + 64 = 100