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Natural selection is an algorithm that needs only variation, retention, and a gradient.","tier":"system","weight":0.95,"status":"active","source_ids":["ws1"],"posted_by":null,"who_claims":null,"edges":[{"type":"supported_by","target":"ws1","source_type":"primary","hash":null}]},{"id":"w2","text":"Population pressure breeds struggle. Struggle breeds divergence. 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