215 lines
6.3 KiB
C++
215 lines
6.3 KiB
C++
/*!
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* 06_light_shading.cpp
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*
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* Copyright (c) 2015-2024, NADAL Jean-Baptiste. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*
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* @Author: NADAL Jean-Baptiste
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* @Date: 14/02/2024
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*
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*/
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/*---------------------------------------------------------------------------*/
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#include <catch.hpp>
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#include "raytracing.h"
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using namespace Raytracer;
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/* ------------------------------------------------------------------------- */
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SCENARIO("The normal on a sphere at point a on the x axis", "[features/spheres.feature]")
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{
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GIVEN("s <- sphere()")
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{
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Sphere s;
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WHEN("n <- normal_at(s, point(1,0,0))")
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{
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Tuple n = s.normal_at(Tuple::Point(1, 0, 0));
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THEN("n = vector(1,0,0)")
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{
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REQUIRE(n == Tuple::Vector(1, 0, 0));
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The normal on a sphere at point a on the y axis", "[features/spheres.feature]")
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{
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GIVEN("s <- sphere()")
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{
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Sphere s;
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WHEN("n <- normal_at(s, point(0,1,0))")
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{
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Tuple n = s.normal_at(Tuple::Point(0, 1, 0));
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THEN("n = vector(0,1,0)")
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{
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REQUIRE(n == Tuple::Vector(0, 1, 0));
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The normal on a sphere at point a on the z axis", "[features/spheres.feature]")
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{
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GIVEN("s <- sphere()")
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{
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Sphere s;
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WHEN("n <- normal_at(s, point(0,0,1))")
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{
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Tuple n = s.normal_at(Tuple::Point(0, 0, 1));
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THEN("n = vector(0,0,1)")
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{
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REQUIRE(n == Tuple::Vector(0, 0, 1));
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The normal on a sphere at a nonaxial point", "[features/spheres.feature]")
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{
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GIVEN("s <- sphere()")
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{
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Sphere s;
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WHEN("n <- normal_at(s, point(sqrt(3)/3,sqrt(3)/3,sqrt(3)/3))")
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{
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Tuple n = s.normal_at(Tuple::Point(sqrt(3) / 3, sqrt(3) / 3, sqrt(3) / 3));
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THEN("n = vector(sqrt(3)/3,sqrt(3)/3,sqrt(3)/3))")
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{
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REQUIRE(n == Tuple::Vector(sqrt(3) / 3, sqrt(3) / 3, sqrt(3) / 3));
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("The normal is a normalized vector", "[features/spheres.feature]")
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{
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GIVEN("s <- sphere()")
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{
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Sphere s;
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WHEN("n <- normal_at(s, point(sqrt(3)/3,sqrt(3)/3,sqrt(3)/3))")
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{
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Tuple n = s.normal_at(Tuple::Point(sqrt(3) / 3, sqrt(3) / 3, sqrt(3) / 3));
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THEN("n = normalize(n)")
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{
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REQUIRE(n == n.normalize());
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Computing the normal on a translated sphere", "[features/spheres.feature]")
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{
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GIVEN("s <- sphere()")
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{
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Sphere s;
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AND_GIVEN("set_transform(s, translation(0,1,0))")
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{
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s.set_transform(Matrix::translation(0, 1, 0));
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WHEN("n <- normal_at(s,point(0,1.70711,-0.70711))")
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{
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Tuple n = s.normal_at(Tuple::Point(0, 1.70711, -0.70711));
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THEN("n = vector(0,0.70711, -0.70711)")
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{
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REQUIRE(n == Tuple::Vector(0, 0.70711, -0.70711));
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Computing the normal on a transformed sphere", "[features/spheres.feature]")
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{
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GIVEN("s <- sphere()")
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{
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Sphere s;
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AND_GIVEN("m <- scaling(1,0.5,1) * rotation_z(pi/5)")
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{
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Matrix m = Matrix::scaling(1, 0.5, 1) * Matrix::rotation_z(std::numbers::pi / 5);
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AND_GIVEN("set_transform(s, m)")
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{
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s.set_transform(m);
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WHEN("n <- normal_at(s,point(0,sqrt(2)/2,sqrt(2)/2))")
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{
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Tuple n = s.normal_at(Tuple::Point(0, sqrt(2) / 2, -sqrt(2) / 2));
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THEN("n = vector(0,97014, -0.24254)")
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{
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REQUIRE(n == Tuple::Vector(0, 0.97014, -0.24254));
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}
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Reflecting a vector approaching at 45°", "[features/tuples.feature]")
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{
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GIVEN("v <-vector(1, -1, 0)")
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{
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Tuple v = Tuple::Vector(1, -1, 0);
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AND_GIVEN("n <-vector(0, 1, 0)")
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{
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Tuple n = Tuple::Vector(0, 1, 0);
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WHEN("r <- reflect(v,n)")
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{
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Tuple r = v.reflect(n);
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THEN("r = vector(1,1,0)")
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{
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REQUIRE(r == Tuple::Vector(1, 1, 0));
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}
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}
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}
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}
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}
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/* ------------------------------------------------------------------------- */
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SCENARIO("Reflecting a vector off a slanted surface", "[features/tuples.feature]")
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{
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GIVEN("v <-vector(0, -1, 0)")
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{
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Tuple v = Tuple::Vector(0, -1, 0);
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AND_GIVEN("n <-vector(sqrt(2)/2, sqrt(2)/2, 0)")
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{
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Tuple n = Tuple::Vector(sqrt(2) / 2, sqrt(2) / 2, 0);
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WHEN("r <- reflect(v,n)")
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{
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Tuple r = v.reflect(n);
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THEN("r = vector(1,0,0)")
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{
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REQUIRE(r == Tuple::Vector(1, 0, 0));
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}
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}
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}
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}
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}
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