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Theory in iOS optimized category icons

beta, character, creative, education, font, grid, math, physics, second, shape, special, stroke, theory
beta, character, creative, education, font, grid, math, physics, second, shape, special, stroke, theory
alpha, character, creative, education, first, font, greek, grid, letters, maths, physics, shape, special, stroke, theory
alpha, character, creative, education, first, font, greek, grid, letters, maths, physics, shape, special, stroke, theory