system, compare, predict, process, structure, population, resource, technology, model, function, government, geography, migration, independence, equality, justice, policy, community, citizen, timeline, primary, secondary, author, purpose, audience, diagram, formula, fraction, decimal, estimate, variable, energy, matter, element, organism, habitat, weather, climate, erosion, experiment, observe, conclude, hypothesis, result, pattern, sequence, operation, equation, ratio, percent.

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