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It is illegal to inhale nitrous oxide though this is rarely enforced and it is illegal to sell nitrous to those under 18 . All nations must stop creating weapons of death and destruction or we will have no world left that is not contaminated and unlivable . It is thus that a body of laws forms a group , or rather a circle , in which each is reciprocally supported and supports . It is expected that the papers will be “ tight ” , that is well written and edited and containing meaningful information , insight , discussion , and analysis . However , where a document within each class contains material DFID considers exempt this is clearly stated and the reasons for withholding certain information explained .