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activation energy activation function activation record activational activationist activationless activator activatory active active agent active air defense active application active birth active camouflage active citizen active couple active dry yeast active duty active euthanasia active fault active front active galactic nucleus active galaxy active gravitational mass active immunity active ingredient active learning active listening active material active matrix active matrix screen active measures active participle active photolocation active placebo active power active radicalization active service active shooter active site active solar active transport active trust active vocabulary active voice active volcano actively activeness activewear activin