Describir: The Grammar of materials /

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|  __ \\  | || | ||  / ____||   / _ \\   | |/ //   / _ \\   /  ___|| | || | || 
| |  \ || | || | || / //---`'  / //\ \\  | ' //   | / \ || | // __   | || | || 
| |__/ || | \\_/ || \ \\___   |  ___  || | . \\   | \_/ || | \\_\ || | \\_/ || 
|_____//   \____//   \_____|| |_||  |_|| |_|\_\\   \___//   \____//   \____//  
 -----`     `---`     `----`  `-`   `-`  `-` --`   `---`     `---`     `---`