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brain with a puzzle, one piece highlighted, symbolizing search for solutions and self-discovery, 2D isometric style, simple shape, clear shadows and highlights emoji
silhouette of a head with a pulsating wave or spiral on the crown area symbolizing headache, clear shadows and highlights, 2D isometric style emoji
silhouette of a head with a red spot on the forehead area symbolizing headache, clear shadows and highlights, 2D isometric style emoji
silhouette of a head with a lightning bolt passing through the temple area symbolizing headache, clear shadows and highlights, 2D isometric style emoji