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Volumn 262, Issue 5, 2011, Pages 886-893

A comparison of different survey methods for assessing gap parameters in old-growth forests

Author keywords

Aerial photography; Belt transect method; Canopy dynamics; Canopy height profile; Digital surface model; Power law function

Indexed keywords

AERIAL PHOTOGRAPHY; ANTENNAS; DYNAMICS; PHOTOGRAPHIC EQUIPMENT; SURVEYS;

EID: 79958769870     PISSN: 03781127     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.foreco.2011.05.029     Document Type: Article
Times cited : (19)

References (54)
  • 1
    • 0029808310 scopus 로고    scopus 로고
    • Line intersect sampling of forest canopy gaps
    • Battles J.J., Dushoff J.G., Fahey T.J. Line intersect sampling of forest canopy gaps. For. Sci. 1996, 42:131-138.
    • (1996) For. Sci. , vol.42 , pp. 131-138
    • Battles, J.J.1    Dushoff, J.G.2    Fahey, T.J.3
  • 2
    • 79958765214 scopus 로고    scopus 로고
    • A model of tropical rain forest depletion in Brunei Darussalam. Proceedings of the 15th ARSP conference, Alice Springs, September, 2010. Available from: <>.
    • Becek, K., Yamamoto, S.I., 2010. A model of tropical rain forest depletion in Brunei Darussalam. Proceedings of the 15th ARSP conference, Alice Springs, September, 2010. Available from: <>http://www.15.arspc.com/proceedings.
    • (2010)
    • Becek, K.1    Yamamoto, S.I.2
  • 3
    • 0001577390 scopus 로고
    • The definition of treefall gap and its effect on measures of forest dynamics
    • Brokaw N.V.L. The definition of treefall gap and its effect on measures of forest dynamics. Biotropica 1982, 14:158-160.
    • (1982) Biotropica , vol.14 , pp. 158-160
    • Brokaw, N.V.L.1
  • 4
    • 0026364697 scopus 로고
    • Forest structure before and after hurricane Hugo at three elevations in the Luquillo Mountains, Puerto Rico
    • Brokaw N.V.L., Grear J.S. Forest structure before and after hurricane Hugo at three elevations in the Luquillo Mountains, Puerto Rico. Biotropica 1991, 23:386-392.
    • (1991) Biotropica , vol.23 , pp. 386-392
    • Brokaw, N.V.L.1    Grear, J.S.2
  • 5
    • 0000376078 scopus 로고
    • The use of distance measures in phytosociological sampling
    • Cottam G., Curtis J.T. The use of distance measures in phytosociological sampling. Ecology 1956, 37:451-460.
    • (1956) Ecology , vol.37 , pp. 451-460
    • Cottam, G.1    Curtis, J.T.2
  • 6
    • 0023467656 scopus 로고
    • Tropical rainforest gaps and tree species diversity
    • Denslow J.S. Tropical rainforest gaps and tree species diversity. Annu. Rev. Eco. Syst. 1987, 18:431-451.
    • (1987) Annu. Rev. Eco. Syst. , vol.18 , pp. 431-451
    • Denslow, J.S.1
  • 7
    • 0022843159 scopus 로고
    • Size distribution and expansion of canopy gaps in a northern Appalachian spruce-fir forest
    • Foster J.R., Reiners W.A. Size distribution and expansion of canopy gaps in a northern Appalachian spruce-fir forest. Vegetatio 1986, 68:109-114.
    • (1986) Vegetatio , vol.68 , pp. 109-114
    • Foster, J.R.1    Reiners, W.A.2
  • 8
    • 0042031487 scopus 로고    scopus 로고
    • Canopy structure in a temperate old-growth evergreen forest analyzed by using aerial photographs
    • Fujita T., Itaya A., Miura M., Manabe T., Yamamoto S.I. Canopy structure in a temperate old-growth evergreen forest analyzed by using aerial photographs. Plant Ecol. 2003, 168:23-29.
    • (2003) Plant Ecol. , vol.168 , pp. 23-29
    • Fujita, T.1    Itaya, A.2    Miura, M.3    Manabe, T.4    Yamamoto, S.I.5
  • 9
    • 0042711013 scopus 로고    scopus 로고
    • Long-term canopy dynamics analysed by aerial photographs in a temperate old-growth evergreen broad-leaved forest
    • Fujita T., Itaya A., Miura M., Manabe T., Yamamoto S.I. Long-term canopy dynamics analysed by aerial photographs in a temperate old-growth evergreen broad-leaved forest. J. Ecol. 2003, 91:686-693.
    • (2003) J. Ecol. , vol.91 , pp. 686-693
    • Fujita, T.1    Itaya, A.2    Miura, M.3    Manabe, T.4    Yamamoto, S.I.5
  • 10
    • 11244303593 scopus 로고    scopus 로고
    • Long-term canopy dynamics in a large area of temperate old-growth beech (Fagus crenata) forest: analysis by aerial photographs and digital elevation models
    • Henbo Y., Itaya A., Nishimura N., Yamamoto S.I. Long-term canopy dynamics in a large area of temperate old-growth beech (Fagus crenata) forest: analysis by aerial photographs and digital elevation models. J. Ecol. 2004, 92:945-953.
    • (2004) J. Ecol. , vol.92 , pp. 945-953
    • Henbo, Y.1    Itaya, A.2    Nishimura, N.3    Yamamoto, S.I.4
  • 11
    • 33846309961 scopus 로고    scopus 로고
    • Long-term canopy dynamics analyzed by aerial photographs and digital elevation data in a subalpine old-growth coniferous forest
    • Henbo Y., Itaya A., Nishimura N., Yamamoto S.I. Long-term canopy dynamics analyzed by aerial photographs and digital elevation data in a subalpine old-growth coniferous forest. Ecoscience 2006, 13:451-458.
    • (2006) Ecoscience , vol.13 , pp. 451-458
    • Henbo, Y.1    Itaya, A.2    Nishimura, N.3    Yamamoto, S.I.4
  • 12
    • 76649123934 scopus 로고    scopus 로고
    • Estimation of canopy gap size and gap shape using a hemispherical photographs
    • Hu L., Gong Z., Li J., Zhu J. Estimation of canopy gap size and gap shape using a hemispherical photographs. Trees 2009, 23:1101-1108.
    • (2009) Trees , vol.23 , pp. 1101-1108
    • Hu, L.1    Gong, Z.2    Li, J.3    Zhu, J.4
  • 13
    • 0002307651 scopus 로고
    • Canopy gaps and the dynamics of a neotropical forest
    • Blackwell Scientific Publications, Oxford, M.J. Crawley (Ed.)
    • Hubbell S.P., Foster R.B. Canopy gaps and the dynamics of a neotropical forest. Plant Ecology 1986, 77-96. Blackwell Scientific Publications, Oxford. M.J. Crawley (Ed.).
    • (1986) Plant Ecology , pp. 77-96
    • Hubbell, S.P.1    Foster, R.B.2
  • 14
    • 32944460544 scopus 로고    scopus 로고
    • Development of a digital orthophoto generation system for analysis of forest canopy dynamics
    • Itaya A., Yamamoto S.I. Development of a digital orthophoto generation system for analysis of forest canopy dynamics. Nagoya Univ. For. Sci. 2003, 22:19-25.
    • (2003) Nagoya Univ. For. Sci. , vol.22 , pp. 19-25
    • Itaya, A.1    Yamamoto, S.I.2
  • 15
    • 2942538886 scopus 로고    scopus 로고
    • Canopy height changes of an old-growth evergreen broad-leaved forest analyzed with digital elevation models
    • Itaya A., Miura M., Yamamoto S.I. Canopy height changes of an old-growth evergreen broad-leaved forest analyzed with digital elevation models. For. Ecol. Manage. 2004, 194:403-411.
    • (2004) For. Ecol. Manage. , vol.194 , pp. 403-411
    • Itaya, A.1    Miura, M.2    Yamamoto, S.I.3
  • 16
    • 0001024559 scopus 로고
    • Structure of avian communities in selected Panama and Illinois habitats
    • Karr J.R. Structure of avian communities in selected Panama and Illinois habitats. Ecol. Monogr. 1971, 41:130-148.
    • (1971) Ecol. Monogr. , vol.41 , pp. 130-148
    • Karr, J.R.1
  • 17
    • 72649093255 scopus 로고    scopus 로고
    • Gap dynamics in a near-natural spruce forest at Mt. Broken, Germany
    • Kathke S., Bruelheide H. Gap dynamics in a near-natural spruce forest at Mt. Broken, Germany. For. Ecol. Manage. 2010, 259:624-632.
    • (2010) For. Ecol. Manage. , vol.259 , pp. 624-632
    • Kathke, S.1    Bruelheide, H.2
  • 18
    • 68849095231 scopus 로고    scopus 로고
    • Convergent structural responses of tropical forests to diverse disturbance regimes
    • Kellner J.R., Asner G.P. Convergent structural responses of tropical forests to diverse disturbance regimes. Ecol. Let. 2009, 12:887-897.
    • (2009) Ecol. Let. , vol.12 , pp. 887-897
    • Kellner, J.R.1    Asner, G.P.2
  • 19
    • 58249103967 scopus 로고    scopus 로고
    • Pervasive canopy dynamics produce short-term stability in a tropical rain forest landscape
    • Kellner J.R., Clark D.B., Hubbell S.P. Pervasive canopy dynamics produce short-term stability in a tropical rain forest landscape. Ecol. Let. 2009, 12:155-164.
    • (2009) Ecol. Let. , vol.12 , pp. 155-164
    • Kellner, J.R.1    Clark, D.B.2    Hubbell, S.P.3
  • 20
    • 0024193939 scopus 로고
    • Natural disturbance and gap-phase regeneration in a wind-exposed tropical forest
    • Lawton R.O., Putz F.E. Natural disturbance and gap-phase regeneration in a wind-exposed tropical forest. Ecology 1988, 69:764-777.
    • (1988) Ecology , vol.69 , pp. 764-777
    • Lawton, R.O.1    Putz, F.E.2
  • 21
    • 0000655879 scopus 로고
    • Forests are not just Swiss cheese: canopy stereogeometry of non-gaps in tropical forests
    • Lieberman M., Lieberman M., Peralta R. Forests are not just Swiss cheese: canopy stereogeometry of non-gaps in tropical forests. Ecology 1989, 70:550-552.
    • (1989) Ecology , vol.70 , pp. 550-552
    • Lieberman, M.1    Lieberman, M.2    Peralta, R.3
  • 22
    • 21444446190 scopus 로고    scopus 로고
    • Gap size measurement: the proposal of a new field method
    • Lima R.A.F. Gap size measurement: the proposal of a new field method. For. Ecol. Manage. 2005, 214:413-419.
    • (2005) For. Ecol. Manage. , vol.214 , pp. 413-419
    • Lima, R.A.F.1
  • 24
    • 0034485638 scopus 로고    scopus 로고
    • Population structure and spatial patterns for trees in a temperate old-growth evergreen broad-leaved forest in Japan
    • Manabe T., Nishimura N., Miura M., Yamamoto S.I. Population structure and spatial patterns for trees in a temperate old-growth evergreen broad-leaved forest in Japan. Plant Ecol. 2000, 151:181-197.
    • (2000) Plant Ecol. , vol.151 , pp. 181-197
    • Manabe, T.1    Nishimura, N.2    Miura, M.3    Yamamoto, S.I.4
  • 25
    • 67349250394 scopus 로고    scopus 로고
    • The patch mosaic of an old-growth warm-temperate forest: patch-level discriptions of 40-year gap-forming processes and community structures
    • Manabe T., Shimatani K., Kawasaki S., Aikawa S.I., Yamamoto S.I. The patch mosaic of an old-growth warm-temperate forest: patch-level discriptions of 40-year gap-forming processes and community structures. Ecol. Res. 2009, 24:575-586.
    • (2009) Ecol. Res. , vol.24 , pp. 575-586
    • Manabe, T.1    Shimatani, K.2    Kawasaki, S.3    Aikawa, S.I.4    Yamamoto, S.I.5
  • 26
    • 0034744175 scopus 로고    scopus 로고
    • Gap dynamics of forest trees: a review with particular attention to boreal forests
    • McCarthy J. Gap dynamics of forest trees: a review with particular attention to boreal forests. Environ. Rev. 2001, 9:1-59.
    • (2001) Environ. Rev. , vol.9 , pp. 1-59
    • McCarthy, J.1
  • 27
    • 0034799060 scopus 로고    scopus 로고
    • Forest canopy and community dynamics in a temperate old-growth evergreen broad-leaved forest, SW Japan: a 7-year study of a 4-ha plot
    • Miura M., Manabe T., Nishimura N., Yamamoto S.I. Forest canopy and community dynamics in a temperate old-growth evergreen broad-leaved forest, SW Japan: a 7-year study of a 4-ha plot. J. Ecol. 2001, 89:841-849.
    • (2001) J. Ecol. , vol.89 , pp. 841-849
    • Miura, M.1    Manabe, T.2    Nishimura, N.3    Yamamoto, S.I.4
  • 28
    • 0041350397 scopus 로고    scopus 로고
    • Population structure and spatial patterns of major trees in a subalpine old-growth coniferous forest, central Japan
    • Miyadokoro T., Nishimura N., Yamamoto S.I. Population structure and spatial patterns of major trees in a subalpine old-growth coniferous forest, central Japan. For. Ecol. Manage. 2003, 182:259-272.
    • (2003) For. Ecol. Manage. , vol.182 , pp. 259-272
    • Miyadokoro, T.1    Nishimura, N.2    Yamamoto, S.I.3
  • 29
    • 1842628620 scopus 로고    scopus 로고
    • Dynamics of forest canopy and major tree populations over nine years in a subalpine old-growth coniferous forest, central Japan
    • Miyadokoro Y., Nishimura N., Hoshino D., Yamamoto S.I. Dynamics of forest canopy and major tree populations over nine years in a subalpine old-growth coniferous forest, central Japan. Ecoscience 2004, 11:130-136.
    • (2004) Ecoscience , vol.11 , pp. 130-136
    • Miyadokoro, Y.1    Nishimura, N.2    Hoshino, D.3    Yamamoto, S.I.4
  • 31
    • 0028992172 scopus 로고
    • Forest canopy structure analyzed by using aerial photographs
    • Nakashizuka T., Katsuki T., Tanaka H. Forest canopy structure analyzed by using aerial photographs. Ecol. Res. 1995, 10:13-18.
    • (1995) Ecol. Res. , vol.10 , pp. 13-18
    • Nakashizuka, T.1    Katsuki, T.2    Tanaka, H.3
  • 32
    • 0001903720 scopus 로고
    • Architecture and energy exchange of dicotyledonous trees in the forest
    • Cambridge University Press, New York, P.B. Tomlinson, M.H. Zimmerman (Eds.)
    • Oldeman R.A.A. Architecture and energy exchange of dicotyledonous trees in the forest. Tropical Trees as Living Systems 1978, 535-560. Cambridge University Press, New York. P.B. Tomlinson, M.H. Zimmerman (Eds.).
    • (1978) Tropical Trees as Living Systems , pp. 535-560
    • Oldeman, R.A.A.1
  • 33
    • 0000443708 scopus 로고
    • Gap regeneration in some old-growth forests of the eastern United States
    • Runkle J.R. Gap regeneration in some old-growth forests of the eastern United States. Ecology 1981, 62:1041-1051.
    • (1981) Ecology , vol.62 , pp. 1041-1051
    • Runkle, J.R.1
  • 34
    • 0020461658 scopus 로고
    • Patterns of disturbance in some old-growth mesic forests of eastern North America
    • Runkle J.R. Patterns of disturbance in some old-growth mesic forests of eastern North America. Ecology 1982, 63:1533-1546.
    • (1982) Ecology , vol.63 , pp. 1533-1546
    • Runkle, J.R.1
  • 35
    • 0022237837 scopus 로고
    • Comparison of methods for determining fraction of land area in treefall gaps
    • Runkle J.R. Comparison of methods for determining fraction of land area in treefall gaps. For. Sci. 1985, 31:15-19.
    • (1985) For. Sci. , vol.31 , pp. 15-19
    • Runkle, J.R.1
  • 36
    • 79958766398 scopus 로고
    • Guidelines and sample protocol for sampling forest gaps. U.S.D.A. For. Serv. Gen. Tech. Rep. PNW-GTR-283.
    • Runkle, J. R., 1992. Guidelines and sample protocol for sampling forest gaps. U.S.D.A. For. Serv. Gen. Tech. Rep. PNW-GTR-283.
    • (1992)
    • Runkle, J.R.1
  • 37
    • 0031828680 scopus 로고    scopus 로고
    • Changes in southern Appalachian canopy tree gaps sampled thrice
    • Runkle J.R. Changes in southern Appalachian canopy tree gaps sampled thrice. Ecology 1998, 79:1768-1780.
    • (1998) Ecology , vol.79 , pp. 1768-1780
    • Runkle, J.R.1
  • 38
    • 0023468464 scopus 로고
    • Treefalls revisited: gap dynamics in the southern Appalachians
    • Runkle J.R., Yetter J.C. Treefalls revisited: gap dynamics in the southern Appalachians. Ecology 1987, 68:417-424.
    • (1987) Ecology , vol.68 , pp. 417-424
    • Runkle, J.R.1    Yetter, J.C.2
  • 39
    • 77949446292 scopus 로고    scopus 로고
    • Gap characteristics and their effects on regeneration, dominance and early growth of woody species
    • Sapkota I.P., Odén P.C. Gap characteristics and their effects on regeneration, dominance and early growth of woody species. J. Plant Ecol. 2009, 2:21-29.
    • (2009) J. Plant Ecol. , vol.2 , pp. 21-29
    • Sapkota, I.P.1    Odén, P.C.2
  • 40
    • 79951946984 scopus 로고    scopus 로고
    • Methods for studying treefall gaps: a review
    • Schliemann S.A., Bockheim J.G. Methods for studying treefall gaps: a review. For. Ecol. Manage. 2011, 261:1143-1151.
    • (2011) For. Ecol. Manage. , vol.261 , pp. 1143-1151
    • Schliemann, S.A.1    Bockheim, J.G.2
  • 41
    • 0025693376 scopus 로고
    • Canopy gaps in Douglas-fir forests of the Cascade Mountains
    • Spies T.A., Franklin J.F., Klopsch M. Canopy gaps in Douglas-fir forests of the Cascade Mountains. Can. J. For. Res. 1990, 20:649-658.
    • (1990) Can. J. For. Res. , vol.20 , pp. 649-658
    • Spies, T.A.1    Franklin, J.F.2    Klopsch, M.3
  • 42
    • 0030616881 scopus 로고    scopus 로고
    • Fifteen years of canopy dynamics analyzed by aerial photographs in a temperate deciduous forest, Japan
    • Tanaka H., Nakashizuka T. Fifteen years of canopy dynamics analyzed by aerial photographs in a temperate deciduous forest, Japan. Ecology 1997, 78:612-620.
    • (1997) Ecology , vol.78 , pp. 612-620
    • Tanaka, H.1    Nakashizuka, T.2
  • 43
    • 77952918903 scopus 로고    scopus 로고
    • Interaction of multiple disturbances in shaping boreal forest dynamics: a spatially explicit analysis using multi-temporal lidar data and high-resolution imagery
    • Vepakomma U., Kneeshow D., St-Onge B. Interaction of multiple disturbances in shaping boreal forest dynamics: a spatially explicit analysis using multi-temporal lidar data and high-resolution imagery. J. Ecol. 2010, 98:526-539.
    • (2010) J. Ecol. , vol.98 , pp. 526-539
    • Vepakomma, U.1    Kneeshow, D.2    St-Onge, B.3
  • 44
    • 42949085864 scopus 로고    scopus 로고
    • On estimating the exponent of power-law frequency distributions
    • White E.P., Enquist B.J., Green J.L. On estimating the exponent of power-law frequency distributions. Ecology 2008, 89:905-912.
    • (2008) Ecology , vol.89 , pp. 905-912
    • White, E.P.1    Enquist, B.J.2    Green, J.L.3
  • 45
    • 0027882652 scopus 로고
    • Use of hemispherical photographs in forest ecology: measurement of gap size and radiation totals in a Bornean tropical rain forest
    • Whitmore T.C., Brown N.D., Swaine M.D., Kennedy D., Goodwin-Bailey C.I., Gong W.-K. Use of hemispherical photographs in forest ecology: measurement of gap size and radiation totals in a Bornean tropical rain forest. J. Trop. Ecol. 1993, 9:131-151.
    • (1993) J. Trop. Ecol. , vol.9 , pp. 131-151
    • Whitmore, T.C.1    Brown, N.D.2    Swaine, M.D.3    Kennedy, D.4    Goodwin-Bailey, C.I.5    Gong, W.-K.6
  • 46
    • 51249177440 scopus 로고
    • Gap dynamics in climax Fagus crenata forests
    • Yamamoto S.I. Gap dynamics in climax Fagus crenata forests. Bot. Mag. Tokyo 1989, 102:93-114.
    • (1989) Bot. Mag. Tokyo , vol.102 , pp. 93-114
    • Yamamoto, S.I.1
  • 47
    • 51249169963 scopus 로고
    • Gap characteristics and gap regeneration in primary evergreen broad-leaved forests of western Japan
    • Yamamoto S.I. Gap characteristics and gap regeneration in primary evergreen broad-leaved forests of western Japan. Bot. Mag. Tokyo 1992, 105:29-45.
    • (1992) Bot. Mag. Tokyo , vol.105 , pp. 29-45
    • Yamamoto, S.I.1
  • 48
    • 0027330850 scopus 로고
    • Gap characteristics and gap regeneration in a subalpine coniferous forest on Mt Ontake, central Honshu, Japan
    • Yamamoto S.I. Gap characteristics and gap regeneration in a subalpine coniferous forest on Mt Ontake, central Honshu, Japan. Ecol. Res. 1993, 8:277-285.
    • (1993) Ecol. Res. , vol.8 , pp. 277-285
    • Yamamoto, S.I.1
  • 49
    • 0030303657 scopus 로고    scopus 로고
    • Gap regeneration of major tree species in different forest types of Japan
    • Yamamoto S.I. Gap regeneration of major tree species in different forest types of Japan. Vegetatio 1996, 127:203-213.
    • (1996) Vegetatio , vol.127 , pp. 203-213
    • Yamamoto, S.I.1
  • 50
    • 0034214342 scopus 로고    scopus 로고
    • Estimation of the canopy-gap size using two photographs taken at different heights
    • Yamamoto K. Estimation of the canopy-gap size using two photographs taken at different heights. Ecol. Res. 2000, 15:203-208.
    • (2000) Ecol. Res. , vol.15 , pp. 203-208
    • Yamamoto, K.1
  • 51
    • 0000101388 scopus 로고    scopus 로고
    • Forest gap dynamics and tree regeneration
    • Yamamoto S.I. Forest gap dynamics and tree regeneration. J. For. Res. 2000, 5:223-229.
    • (2000) J. For. Res. , vol.5 , pp. 223-229
    • Yamamoto, S.I.1
  • 52
    • 79958771138 scopus 로고
    • Studies in the evergreen broad-leaved forest of Tatera Forest Reserve, Tshushima, Japan. V. Canopy gaps and gap regeneration in mature stands. Bull. Faculty of Liberal Arts, Nagasaki University, Natural Science, 35 No. 1, 17-26.
    • Yamamoto, S.I., Itow, S., 1994. Studies in the evergreen broad-leaved forest of Tatera Forest Reserve, Tshushima, Japan. V. Canopy gaps and gap regeneration in mature stands. Bull. Faculty of Liberal Arts, Nagasaki University, Natural Science, 35 No. 1, 17-26.
    • (1994)
    • Yamamoto, S.I.1    Itow, S.2
  • 53
    • 0032915757 scopus 로고    scopus 로고
    • Canopy gap formation and replacement pattern of major tree species among developmental stages of beech (Fagus crenata) stands, Japan
    • Yamamoto S.I., Nishimura N. Canopy gap formation and replacement pattern of major tree species among developmental stages of beech (Fagus crenata) stands, Japan. Plant Ecol. 1999, 140:167-176.
    • (1999) Plant Ecol. , vol.140 , pp. 167-176
    • Yamamoto, S.I.1    Nishimura, N.2
  • 54
    • 0028995125 scopus 로고
    • Natural disturbance and tree species coexistence in an old-growth beech-dwarf bamboo forest, southwestern Japan
    • Yamamoto S.I., Nishimura N., Matsui K. Natural disturbance and tree species coexistence in an old-growth beech-dwarf bamboo forest, southwestern Japan. J. Veg. Sci. 1995, 6:875-886.
    • (1995) J. Veg. Sci. , vol.6 , pp. 875-886
    • Yamamoto, S.I.1    Nishimura, N.2    Matsui, K.3


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