13_______ 8 _ _             13_______   13\____x-'--\\x    8// 8\\    13x//--'-x____/    13\_____x---\\ 8 (( 12~7 12~8 )) 13 //---x_____/      13\_____x--\*8((7\4 = 7/8))13*/--x_____/         13\___x \-*8))) (((13*- x___/           13\___*_/8((( )))13\_*___/                   8)) ((