def test_all_refracted(self):
dir = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1], [1, -1, -1]] / N.sqrt(3)
position = N.c_[[0,0,1], [1,-1,1], [1,1,1], [-1,1,1]]
en = N.r_[100, 200, 300, 400]
bund = RayBundle(position, dir, energy=en, ref_index=N.ones(4))
gm = FlatGeometryManager()
prm = gm.find_intersections(N.eye(4), bund)
refractive = optics_callables.RefractiveHomogenous(1,1.5)
selector = N.array([0, 1, 3])
gm.select_rays(selector)
outg = refractive(gm, bund, selector)
correct_pts = N.zeros((3,4))
correct_pts[:2,0] = 1
correct_pts = N.hstack((correct_pts[:,selector], correct_pts[:,selector]))
N.testing.assert_array_equal(outg.get_vertices(), correct_pts)
norm = N.c_[gm.get_normals()[:,0]]
correct_refl_cos = -(dir*norm).sum(axis=0)[selector]
correct_refr_cos = -N.sqrt(1 - (1./1.5)**2*(1 - correct_refl_cos**2))
outg_cos = (outg.get_directions()*norm).sum(axis=0)
N.testing.assert_array_equal(outg_cos, N.r_[correct_refl_cos, correct_refr_cos])
N.testing.assert_array_equal(outg.get_energy().reshape(2,-1).sum(axis=0), \
N.r_[100, 200, 400]) # reflection and refraction sum to 100%
N.testing.assert_array_equal(outg.get_parents(), N.tile(selector, 2))
class TestFlatGeomTranslated(unittest.TestCase):
def setUp(self):
dir = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1], [1, -1, -1]] / math.sqrt(3)
position = N.c_[[0,0,1], [1,-1,1], [1,1,1], [-1,1,1]]
self._bund = RayBundle(position, dir)
self.gm = FlatGeometryManager()
frame = SP.translate(1., 0., 0.)
self.prm = self.gm.find_intersections(frame, self._bund)
def test_find_intersections(self):
"""The correct parametric locations are found for translated flat geometry"""
self.failUnlessEqual(self.prm.shape, (4,),
"Shape of parametric location array is wrong: " + \
str(self.prm.shape))
N.testing.assert_array_almost_equal(self.prm, N.sqrt(3))
def test_get_normals(self):
"""A translated flat geometry manager returns parallel normals"""
self.gm.select_rays(N.arange(4))
n = self.gm.get_normals()
N.testing.assert_array_equal(n, N.tile(N.c_[[0, 0, 1]], (1,4)))
def test_inters_points_global(self):
"""When translated, a flat surface returns correct intersections"""
correct_pts = N.zeros((3,4))
correct_pts[:2,0] = 1
self.gm.select_rays(N.arange(4))
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_equal(pts, correct_pts)
class TestFlatGeomTranslated(unittest.TestCase):
def setUp(self):
dir = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1],
[1, -1, -1]] / math.sqrt(3)
position = N.c_[[0, 0, 1], [1, -1, 1], [1, 1, 1], [-1, 1, 1]]
self._bund = RayBundle(position, dir)
self.gm = FlatGeometryManager()
frame = SP.translate(1., 0., 0.)
self.prm = self.gm.find_intersections(frame, self._bund)
def test_find_intersections(self):
"""The correct parametric locations are found for translated flat geometry"""
self.failUnlessEqual(self.prm.shape, (4,),
"Shape of parametric location array is wrong: " + \
str(self.prm.shape))
N.testing.assert_array_almost_equal(self.prm, N.sqrt(3))
def test_get_normals(self):
"""A translated flat geometry manager returns parallel normals"""
self.gm.select_rays(N.arange(4))
n = self.gm.get_normals()
N.testing.assert_array_equal(n, N.tile(N.c_[[0, 0, 1]], (1, 4)))
def test_inters_points_global(self):
"""When translated, a flat surface returns correct intersections"""
correct_pts = N.zeros((3, 4))
correct_pts[:2, 0] = 1
self.gm.select_rays(N.arange(4))
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_equal(pts, correct_pts)
def test_up_down(self):
"""Rays coming from below are absorbed, from above reflected"""
going_down = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1], [1, -1, -1]] / N.sqrt(3)
going_up = going_down.copy()
going_up[2] = 1 / N.sqrt(3)
pos_up = N.c_[[0,0,1], [1,-1,1], [1,1,1], [-1,1,1]]
pos_down = pos_up.copy()
pos_down[2] = -1
bund = RayBundle()
bund.set_directions(N.hstack((going_down, going_up)))
bund.set_vertices(N.hstack((pos_up, pos_down)))
bund.set_energy(N.tile(100, 8))
bund.set_ref_index(N.tile(1, 8))
gm = FlatGeometryManager()
prm = gm.find_intersections(N.eye(4), bund)
absref = optics_callables.AbsorberReflector(0.)
selector = N.arange(8)
gm.select_rays(selector)
outg = absref(gm, bund, selector)
e = outg.get_energy()
N.testing.assert_array_equal(e[:4], 100)
N.testing.assert_array_equal(e[4:], 0)
def test_all_refracted(self):
dir = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1], [1, -1, -1]] / N.sqrt(3)
position = N.c_[[0,0,1], [1,-1,1], [1,1,1], [-1,1,1]]
en = N.r_[100, 200, 300, 400]
bund = RayBundle(position, dir, energy=en, ref_index=N.ones(4))
gm = FlatGeometryManager()
prm = gm.find_intersections(N.eye(4), bund)
refractive = optics_callables.RefractiveHomogenous(1,1.5)
selector = N.array([0, 1, 3])
gm.select_rays(selector)
outg = refractive(gm, bund, selector)
correct_pts = N.zeros((3,4))
correct_pts[:2,0] = 1
correct_pts = N.hstack((correct_pts[:,selector], correct_pts[:,selector]))
N.testing.assert_array_equal(outg.get_vertices(), correct_pts)
norm = N.c_[gm.get_normals()[:,0]]
correct_refl_cos = -(dir*norm).sum(axis=0)[selector]
correct_refr_cos = -N.sqrt(1 - (1./1.5)**2*(1 - correct_refl_cos**2))
outg_cos = (outg.get_directions()*norm).sum(axis=0)
N.testing.assert_array_equal(outg_cos, N.r_[correct_refl_cos, correct_refr_cos])
N.testing.assert_array_equal(outg.get_energy().reshape(2,-1).sum(axis=0), \
N.r_[100, 200, 400]) # reflection and refraction sum to 100%
N.testing.assert_array_equal(outg.get_parents(), N.tile(selector, 2))
def test_up_down(self):
"""Rays coming from below are absorbed, from above reflected"""
going_down = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1], [1, -1, -1]] / N.sqrt(3)
going_up = going_down.copy()
going_up[2] = 1 / N.sqrt(3)
pos_up = N.c_[[0,0,1], [1,-1,1], [1,1,1], [-1,1,1]]
pos_down = pos_up.copy()
pos_down[2] = -1
bund = RayBundle()
bund.set_directions(N.hstack((going_down, going_up)))
bund.set_vertices(N.hstack((pos_up, pos_down)))
bund.set_energy(N.tile(100, 8))
bund.set_ref_index(N.tile(1, 8))
gm = FlatGeometryManager()
prm = gm.find_intersections(N.eye(4), bund)
absref = optics_callables.AbsorberReflector(0.)
selector = N.arange(8)
gm.select_rays(selector)
outg = absref(gm, bund, selector)
e = outg.get_energy()
N.testing.assert_array_equal(e[:4], 100)
N.testing.assert_array_equal(e[4:], 0)
class TestReflective(unittest.TestCase):
def setUp(self):
"""Set up the ray bundle and geometry"""
dir = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1],
[1, -1, -1]] / N.sqrt(3)
position = N.c_[[0, 0, 1], [1, -1, 1], [1, 1, 1], [-1, 1, 1]]
en = N.r_[100, 200, 300, 400]
self._bund = RayBundle(position, dir, energy=en)
self.gm = FlatGeometryManager()
self.prm = self.gm.find_intersections(N.eye(4), self._bund)
def test_with_absorptivity(self):
"""A correct bundle is generated by reflective, with energy reduced correctly"""
reflective = optics_callables.Reflective(0.1)
self.gm.select_rays(N.arange(4))
outg = reflective(self.gm, self._bund, N.arange(4))
correct_pts = N.zeros((3, 4))
correct_pts[:2, 0] = 1
N.testing.assert_array_equal(outg.get_vertices(), correct_pts)
correct_dirs = N.c_[[1, 1, 1], [-1, 1, 1], [-1, -1, 1],
[1, -1, 1]] / N.sqrt(3)
N.testing.assert_array_equal(outg.get_directions(), correct_dirs)
N.testing.assert_array_equal(outg.get_energy(), N.r_[90, 180, 270,
360])
N.testing.assert_array_equal(outg.get_parents(), N.arange(4))
def test_without_absorptivity(self):
"""Perfect mirroring works"""
reflective = optics_callables.Reflective(0)
self.gm.select_rays(N.arange(4))
outg = reflective(self.gm, self._bund, N.arange(4))
N.testing.assert_array_equal(outg.get_energy(), N.r_[100, 200, 300,
400])
def test_receiver(self):
"""A receiver memorizes all lifetime hits"""
receiver = optics_callables.ReflectiveReceiver() # Perfect absorber
self.gm.select_rays(N.arange(4))
# Round one:
outg = receiver(self.gm, self._bund, N.arange(4))
N.testing.assert_array_equal(outg.get_energy(), 0)
absorbed, hits = receiver.get_all_hits()
N.testing.assert_array_equal(absorbed, N.r_[100, 200, 300, 400])
correct_pts = N.zeros((3, 4))
correct_pts[:2, 0] = 1
N.testing.assert_array_equal(hits, correct_pts)
# Round two:
outg = receiver(self.gm, self._bund, N.arange(4))
absorbed, hits = receiver.get_all_hits()
N.testing.assert_array_equal(absorbed,
N.tile(N.r_[100, 200, 300, 400], 2))
N.testing.assert_array_equal(hits, N.tile(correct_pts, (1, 2)))
class TestFlatGeomTilted(unittest.TestCase):
"""Use a flat surface rotated about the x axis by 45 degrees"""
def setUp(self):
s2 = math.sqrt(2)
dir = N.c_[[1, 0, -s2], [-1, 0, -s2], [-1, -s2, 0],
[1, -s2, 0]] / math.sqrt(3)
position = N.c_[[0, 1 / s2, 1 / s2], [1, 0, s2], [1, s2, 0],
[-1, s2, 0]]
self._bund = RayBundle(position, dir)
self.gm = FlatGeometryManager()
frame = SP.generate_transform(N.r_[1., 0, 0], -N.pi / 4.,
N.zeros((3, 1)))
self.prm = self.gm.find_intersections(frame, self._bund)
def test_find_intersections(self):
"""The correct parametric locations are found for flat geometry"""
self.failUnlessEqual(self.prm.shape, (4,),
"Shape of parametric location array is wrong: " + \
str(self.prm.shape))
N.testing.assert_array_almost_equal(self.prm, math.sqrt(3))
def test_get_normals(self):
"""A tilted flat geometry manager returns parallel normals"""
s2 = math.sqrt(2)
self.gm.select_rays(N.arange(4))
n = self.gm.get_normals()
N.testing.assert_array_almost_equal(
n, N.tile(N.c_[[0, 1 / s2, 1 / s2]], (1, 4)))
def test_select_rays_normals(self):
"""A tilted flat geometry manager returns normals only for selected rays"""
s2 = math.sqrt(2)
self.gm.select_rays(N.r_[1, 3])
n = self.gm.get_normals()
N.testing.assert_array_almost_equal(
n, N.tile(N.c_[[0, 1 / s2, 1 / s2]], (1, 2)))
def test_inters_points_global(self):
"""On the basic setup, a tilted flat surface returns correct intersections"""
correct_pts = N.zeros((3, 4))
s2 = math.sqrt(2)
correct_pts[:, 0] = N.r_[1, 1 / s2, -1 / s2]
self.gm.select_rays(N.arange(4))
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_almost_equal(pts, correct_pts)
def test_select_rays_inters(self):
"""With dropped rays, a tilted flat surface returns correct intersections"""
s2 = math.sqrt(2)
correct_pts = N.zeros((3, 2))
self.gm.select_rays(N.r_[1, 3])
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_almost_equal(pts, correct_pts)
class TestReflective(unittest.TestCase):
def setUp(self):
"""Set up the ray bundle and geometry"""
dir = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1], [1, -1, -1]] / N.sqrt(3)
position = N.c_[[0,0,1], [1,-1,1], [1,1,1], [-1,1,1]]
en = N.r_[100, 200, 300, 400]
self._bund = RayBundle(position, dir, energy=en)
self.gm = FlatGeometryManager()
self.prm = self.gm.find_intersections(N.eye(4), self._bund)
def test_with_absorptivity(self):
"""A correct bundle is generated by reflective, with energy reduced correctly"""
reflective = optics_callables.Reflective(0.1)
self.gm.select_rays(N.arange(4))
outg = reflective(self.gm, self._bund, N.arange(4))
correct_pts = N.zeros((3,4))
correct_pts[:2,0] = 1
N.testing.assert_array_equal(outg.get_vertices(), correct_pts)
correct_dirs = N.c_[[1, 1, 1], [-1, 1, 1], [-1, -1, 1], [1, -1, 1]] / N.sqrt(3)
N.testing.assert_array_equal(outg.get_directions(), correct_dirs)
N.testing.assert_array_equal(outg.get_energy(), N.r_[90, 180, 270, 360])
N.testing.assert_array_equal(outg.get_parents(), N.arange(4))
def test_without_absorptivity(self):
"""Perfect mirroring works"""
reflective = optics_callables.Reflective(0)
self.gm.select_rays(N.arange(4))
outg = reflective(self.gm, self._bund, N.arange(4))
N.testing.assert_array_equal(outg.get_energy(), N.r_[100, 200, 300, 400])
def test_receiver(self):
"""A receiver memorizes all lifetime hits"""
receiver = optics_callables.ReflectiveReceiver() # Perfect absorber
self.gm.select_rays(N.arange(4))
# Round one:
outg = receiver(self.gm, self._bund, N.arange(4))
N.testing.assert_array_equal(outg.get_energy(), 0)
absorbed, hits = receiver.get_all_hits()
N.testing.assert_array_equal(absorbed, N.r_[100, 200, 300, 400])
correct_pts = N.zeros((3,4))
correct_pts[:2,0] = 1
N.testing.assert_array_equal(hits, correct_pts)
# Round two:
outg = receiver(self.gm, self._bund, N.arange(4))
absorbed, hits = receiver.get_all_hits()
N.testing.assert_array_equal(absorbed, N.tile(N.r_[100, 200, 300, 400], 2))
N.testing.assert_array_equal(hits, N.tile(correct_pts, (1,2)))
class TestFlatGeomTilted(unittest.TestCase):
"""Use a flat surface rotated about the x axis by 45 degrees"""
def setUp(self):
s2 = math.sqrt(2)
dir = N.c_[[1, 0, -s2], [-1, 0, -s2], [-1, -s2, 0], [1, -s2, 0]] / math.sqrt(3)
position = N.c_[[0,1/s2,1/s2], [1,0,s2], [1,s2,0], [-1,s2,0]]
self._bund = RayBundle(position, dir)
self.gm = FlatGeometryManager()
frame = SP.generate_transform(N.r_[1., 0, 0], -N.pi/4., N.zeros((3,1)))
self.prm = self.gm.find_intersections(frame, self._bund)
def test_find_intersections(self):
"""The correct parametric locations are found for flat geometry"""
self.failUnlessEqual(self.prm.shape, (4,),
"Shape of parametric location array is wrong: " + \
str(self.prm.shape))
N.testing.assert_array_almost_equal(self.prm, math.sqrt(3))
def test_get_normals(self):
"""A tilted flat geometry manager returns parallel normals"""
s2 = math.sqrt(2)
self.gm.select_rays(N.arange(4))
n = self.gm.get_normals()
N.testing.assert_array_almost_equal(n, N.tile(N.c_[[0,1/s2,1/s2]], (1,4)))
def test_select_rays_normals(self):
"""A tilted flat geometry manager returns normals only for selected rays"""
s2 = math.sqrt(2)
self.gm.select_rays(N.r_[1,3])
n = self.gm.get_normals()
N.testing.assert_array_almost_equal(n, N.tile(N.c_[[0,1/s2,1/s2]], (1,2)))
def test_inters_points_global(self):
"""On the basic setup, a tilted flat surface returns correct intersections"""
correct_pts = N.zeros((3,4))
s2 = math.sqrt(2)
correct_pts[:,0] = N.r_[1, 1/s2, -1/s2]
self.gm.select_rays(N.arange(4))
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_almost_equal(pts, correct_pts)
def test_select_rays_inters(self):
"""With dropped rays, a tilted flat surface returns correct intersections"""
s2 = math.sqrt(2)
correct_pts = N.zeros((3,2))
self.gm.select_rays(N.r_[1,3])
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_almost_equal(pts, correct_pts)
class TestBacksideNormals(unittest.TestCase):
def setUp(self):
dir = N.c_[[1, 1, 1], [-1, 1, 1], [-1, -1, 1], [1, -1, 1]] / math.sqrt(3)
position = N.c_[[0,0,-1], [1,-1,-1], [1,1,-1], [-1,1,-1]]
self._bund = RayBundle(position, dir)
self.gm = FlatGeometryManager()
self.prm = self.gm.find_intersections(N.eye(4), self._bund)
def test_get_normals(self):
"""A translated flat geometry manager returns parallel normals"""
self.gm.select_rays(N.arange(4))
n = self.gm.get_normals()
N.testing.assert_array_equal(n, N.tile(N.c_[[0, 0, -1]], (1,4)))
class TestBacksideNormals(unittest.TestCase):
def setUp(self):
dir = N.c_[[1, 1, 1], [-1, 1, 1], [-1, -1, 1],
[1, -1, 1]] / math.sqrt(3)
position = N.c_[[0, 0, -1], [1, -1, -1], [1, 1, -1], [-1, 1, -1]]
self._bund = RayBundle(position, dir)
self.gm = FlatGeometryManager()
self.prm = self.gm.find_intersections(N.eye(4), self._bund)
def test_get_normals(self):
"""A translated flat geometry manager returns parallel normals"""
self.gm.select_rays(N.arange(4))
n = self.gm.get_normals()
N.testing.assert_array_equal(n, N.tile(N.c_[[0, 0, -1]], (1, 4)))
def test_TIR(self):
dir = N.c_[[0, N.cos(N.pi/180), -N.sin(N.pi/180)]]
position = N.c_[[0,0,1]]
en = N.r_[100]
bund = RayBundle(position, dir, energy=en, ref_index=N.r_[1.5])
gm = FlatGeometryManager()
prm = gm.find_intersections(N.eye(4), bund)
refractive = optics_callables.RefractiveHomogenous(1.,1.5)
selector = N.r_[0]
gm.select_rays(selector)
outg = refractive(gm, bund, selector)
self.failUnlessEqual(outg.get_vertices().shape, (3,1))
N.testing.assert_array_equal(outg.get_directions(),
N.c_[[0, N.cos(N.pi/180), N.sin(N.pi/180)]])
N.testing.assert_array_equal(outg.get_energy(), N.r_[100])
N.testing.assert_array_equal(outg.get_parents(), N.r_[0])
def test_TIR(self):
dir = N.c_[[0, N.cos(N.pi/180), -N.sin(N.pi/180)]]
position = N.c_[[0,0,1]]
en = N.r_[100]
bund = RayBundle(position, dir, energy=en, ref_index=N.r_[1.5])
gm = FlatGeometryManager()
prm = gm.find_intersections(N.eye(4), bund)
refractive = optics_callables.RefractiveHomogenous(1.,1.5)
selector = N.r_[0]
gm.select_rays(selector)
outg = refractive(gm, bund, selector)
self.failUnlessEqual(outg.get_vertices().shape, (3,1))
N.testing.assert_array_equal(outg.get_directions(),
N.c_[[0, N.cos(N.pi/180), N.sin(N.pi/180)]])
N.testing.assert_array_equal(outg.get_energy(), N.r_[100])
N.testing.assert_array_equal(outg.get_parents(), N.r_[0])
class TestFlatGeomManagerInterface(unittest.TestCase):
def setUp(self):
dir = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1],
[1, -1, -1]] / math.sqrt(3)
position = N.c_[[0, 0, 1], [1, -1, 1], [1, 1, 1], [-1, 1, 1]]
self._bund = RayBundle(position, dir)
self.gm = FlatGeometryManager()
self.prm = self.gm.find_intersections(N.eye(4), self._bund)
def test_find_intersections(self):
"""The correct parametric locations are found for flat geometry"""
self.failUnlessEqual(self.prm.shape, (4,),
"Shape of parametric location array is wrong: " + \
str(self.prm.shape))
N.testing.assert_array_almost_equal(self.prm, N.sqrt(3))
def test_get_normals(self):
"""A flat geometry manager returns parallel normals"""
self.gm.select_rays(N.arange(4))
n = self.gm.get_normals()
N.testing.assert_array_equal(n, N.tile(N.c_[[0, 0, 1]], (1, 4)))
def test_select_rays_normals(self):
"""Correct normals when some rays not selected"""
self.gm.select_rays(N.r_[1, 3])
n = self.gm.get_normals()
N.testing.assert_array_equal(n, N.tile(N.c_[[0, 0, 1]], (1, 2)))
def test_inters_points_global(self):
"""On the basic setup, a flat surface returns correct intersections"""
correct_pts = N.zeros((3, 4))
correct_pts[:2, 0] = 1
self.gm.select_rays(N.arange(4))
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_equal(pts, correct_pts)
def select_rays_inters(self):
"""Correct intersections when some rays not selected"""
correct_pts = N.zeros((3, 2))
correct_pts[:2, 0] = 1
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_equal(pts, correct_pts)
class TestFlatGeomManagerInterface(unittest.TestCase):
def setUp(self):
dir = N.c_[[1, 1, -1], [-1, 1, -1], [-1, -1, -1], [1, -1, -1]] / math.sqrt(3)
position = N.c_[[0,0,1], [1,-1,1], [1,1,1], [-1,1,1]]
self._bund = RayBundle(position, dir)
self.gm = FlatGeometryManager()
self.prm = self.gm.find_intersections(N.eye(4), self._bund)
def test_find_intersections(self):
"""The correct parametric locations are found for flat geometry"""
self.failUnlessEqual(self.prm.shape, (4,),
"Shape of parametric location array is wrong: " + \
str(self.prm.shape))
N.testing.assert_array_almost_equal(self.prm, N.sqrt(3))
def test_get_normals(self):
"""A flat geometry manager returns parallel normals"""
self.gm.select_rays(N.arange(4))
n = self.gm.get_normals()
N.testing.assert_array_equal(n, N.tile(N.c_[[0, 0, 1]], (1,4)))
def test_select_rays_normals(self):
"""Correct normals when some rays not selected"""
self.gm.select_rays(N.r_[1,3])
n = self.gm.get_normals()
N.testing.assert_array_equal(n, N.tile(N.c_[[0, 0, 1]], (1,2)))
def test_inters_points_global(self):
"""On the basic setup, a flat surface returns correct intersections"""
correct_pts = N.zeros((3,4))
correct_pts[:2,0] = 1
self.gm.select_rays(N.arange(4))
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_equal(pts, correct_pts)
def select_rays_inters(self):
"""Correct intersections when some rays not selected"""
correct_pts = N.zeros((3,2))
correct_pts[:2,0] = 1
pts = self.gm.get_intersection_points_global()
N.testing.assert_array_equal(pts, correct_pts)
