Input (grade 12): The spiral plays a specific role in symbolism, and appears in megalithic art, notably in the Newgrange tomb or in many Galician petroglyphs such as the one in Mogor.
Output (grade 7): The spiral plays an important role in symbolism. It appears in megalithic art, notably in the Newgrange tomb or in many Galician petroglyphs such as the one in Mogor.