{"prestress":13,"poststress":10}
{"prestress":15,"poststress":14}
{"prestress":9,"poststress":7}
{"prestress":13,"poststress":15}
{"prestress":15,"poststress":11}
{"prestress":17,"poststress":14}
{"prestress":13,"poststress":13}
{"prestress":16,"poststress":14}
{"prestress":11,"poststress":9}
{"prestress":13,"poststress":14}
{"prestress":9,"poststress":9}
{"prestress":12,"poststress":10}