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Volumn 116, Issue , 2014, Pages 1-8

Forest biomass supply chains in Ireland: A life cycle assessment of GHG emissions and primary energy balances

Author keywords

Energy; Greenhouse gas (GHG); Ireland; Residues; Stumps; Woodchip

Indexed keywords

BIOMASS; ENERGY BALANCE; FORESTRY; GAS EMISSIONS; LIFE CYCLE; SUPPLY CHAINS; WOOD PRODUCTS;

EID: 84889586015     PISSN: 03062619     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.apenergy.2013.11.041     Document Type: Article
Times cited : (66)

References (69)
  • 2
    • 84889583663 scopus 로고    scopus 로고
    • Irish Forestry and Forest Products Association. An overview of the Irish forestry and forest products sector 2011;
    • Irish Forestry and Forest Products Association. An overview of the Irish forestry and forest products sector 2011; 2011.
    • (2011)
  • 3
    • 84889597973 scopus 로고    scopus 로고
    • Department of Agriculture Food and Forestry. Growing for the future -- a strategic action plan for the development of the forestry sector in Ireland. In: Department of Agriculture FaF, editor.
    • Department of Agriculture Food and Forestry. Growing for the future -- a strategic action plan for the development of the forestry sector in Ireland. In: Department of Agriculture FaF, editor. 1996.
    • (1996)
  • 4
    • 84889572065 scopus 로고    scopus 로고
    • Northern European Database of Long-Term Forest Experiments. About Forestry in Northern European Countries. METLA;
    • Northern European Database of Long-Term Forest Experiments. About Forestry in Northern European Countries. METLA; 2012.
    • (2012)
  • 7
    • 33947675268 scopus 로고    scopus 로고
    • Biomass expansion factors for Sitka spruce (Picea sitchensis (Bong.) Carr.) in Ireland
    • Tobin B., Nieuwenhuis M. Biomass expansion factors for Sitka spruce (Picea sitchensis (Bong.) Carr.) in Ireland. Eur J For Res 2007, 126:189-196.
    • (2007) Eur J For Res , vol.126 , pp. 189-196
    • Tobin, B.1    Nieuwenhuis, M.2
  • 8
    • 78951481746 scopus 로고    scopus 로고
    • The distribution and productivity of Sitka spruce (Picea sitchensis) in Ireland in relation to site, soil and climatic factors
    • Farrelly N., Ní Dhubháin Á, Nieuwenhuis M., Grant C. The distribution and productivity of Sitka spruce (Picea sitchensis) in Ireland in relation to site, soil and climatic factors. Irish Forestry 2009, 51-73.
    • (2009) Irish Forestry , pp. 51-73
    • Farrelly, N.1    Ní Dhubháin, Á.2    Nieuwenhuis, M.3    Grant, C.4
  • 9
    • 35448931938 scopus 로고    scopus 로고
    • Productivity and costs of the mechanised cut-to-length wood harvesting system in clear-felling operations
    • Jiroušek R., Klvac R., Skoupý A. Productivity and costs of the mechanised cut-to-length wood harvesting system in clear-felling operations. J For Sci 2007, 53:476-482.
    • (2007) J For Sci , vol.53 , pp. 476-482
    • Jiroušek, R.1    Klvac, R.2    Skoupý, A.3
  • 14
    • 84884202138 scopus 로고    scopus 로고
    • Comparative techno-economic analysis of biomass fuelled combined heat and power for commercial buildings
    • Huang Y., McIlveen-Wright D.R., Rezvani S., Huang M.J., Wang Y.D., Roskilly A.P., et al. Comparative techno-economic analysis of biomass fuelled combined heat and power for commercial buildings. Appl Energy 2013, 112:518-525.
    • (2013) Appl Energy , vol.112 , pp. 518-525
    • Huang, Y.1    McIlveen-Wright, D.R.2    Rezvani, S.3    Huang, M.J.4    Wang, Y.D.5    Roskilly, A.P.6
  • 15
    • 84867481599 scopus 로고    scopus 로고
    • Quantifying the use of brush mats in reducing forwarder peak loads and surface contact pressures
    • Labelle E.R., Jaeger D. Quantifying the use of brush mats in reducing forwarder peak loads and surface contact pressures. Croation J For Eng 2012, 33:249-274.
    • (2012) Croation J For Eng , vol.33 , pp. 249-274
    • Labelle, E.R.1    Jaeger, D.2
  • 18
    • 79958152269 scopus 로고    scopus 로고
    • Time-dependent climate benefits of using forest residues to substitute fossil fuels
    • Sathre R., Gustavsson L. Time-dependent climate benefits of using forest residues to substitute fossil fuels. Biomass Bioenergy 2011, 35:2506-2516.
    • (2011) Biomass Bioenergy , vol.35 , pp. 2506-2516
    • Sathre, R.1    Gustavsson, L.2
  • 19
    • 77149158762 scopus 로고    scopus 로고
    • Stump harvesting for bioenergy - a review of the environmental impacts
    • Walmsley J.D., Godbold D.L. Stump harvesting for bioenergy - a review of the environmental impacts. Forestry 2010, 83:17-38.
    • (2010) Forestry , vol.83 , pp. 17-38
    • Walmsley, J.D.1    Godbold, D.L.2
  • 20
    • 84867677308 scopus 로고    scopus 로고
    • Indirect carbon dioxide emissions from producing bioenergy from forest harvest residues
    • Repo A., Tuomi M., Liski J. Indirect carbon dioxide emissions from producing bioenergy from forest harvest residues. GCB Bioenergy 2011, 3:107-115.
    • (2011) GCB Bioenergy , vol.3 , pp. 107-115
    • Repo, A.1    Tuomi, M.2    Liski, J.3
  • 21
    • 77954213843 scopus 로고    scopus 로고
    • Assessing carbon balance trade-offs between bioenergy and carbon sequestration of stumps at varying time scales and harvest intensities
    • Melin Y., Petersson H., Egnell G. Assessing carbon balance trade-offs between bioenergy and carbon sequestration of stumps at varying time scales and harvest intensities. For Ecol Manage 2010, 260:536-542.
    • (2010) For Ecol Manage , vol.260 , pp. 536-542
    • Melin, Y.1    Petersson, H.2    Egnell, G.3
  • 22
    • 4243155190 scopus 로고    scopus 로고
    • Energy use and environmental impacts of forest operations in Sweden
    • Berg S., Lindholm E.-L. Energy use and environmental impacts of forest operations in Sweden. J Clean Prod 2005, 13:33-42.
    • (2005) J Clean Prod , vol.13 , pp. 33-42
    • Berg, S.1    Lindholm, E.-L.2
  • 23
    • 51049102118 scopus 로고    scopus 로고
    • Comparative analyses of forest fuels in a life cycle perspective with a focus on transport systems
    • Eriksson L.N. Comparative analyses of forest fuels in a life cycle perspective with a focus on transport systems. Resour, Conserv Recycl 2008, 52:1190-1197.
    • (2008) Resour, Conserv Recycl , vol.52 , pp. 1190-1197
    • Eriksson, L.N.1
  • 24
    • 67649199011 scopus 로고    scopus 로고
    • Environmental impacts of forest production and supply of pulpwood: Spanish and Swedish case studies
    • González-García S., Berg S., Feijoo G., Moreira M. Environmental impacts of forest production and supply of pulpwood: Spanish and Swedish case studies. Int J Life Cycle Assess 2009, 14:340-353.
    • (2009) Int J Life Cycle Assess , vol.14 , pp. 340-353
    • González-García, S.1    Berg, S.2    Feijoo, G.3    Moreira, M.4
  • 25
    • 77958513547 scopus 로고    scopus 로고
    • Energy efficiency and the environmental impact of harvesting stumps and logging residues
    • Lindholm E.L., Berg S., Hansson P.A. Energy efficiency and the environmental impact of harvesting stumps and logging residues. Eur J For Res 2010, 129:1223-1235.
    • (2010) Eur J For Res , vol.129 , pp. 1223-1235
    • Lindholm, E.L.1    Berg, S.2    Hansson, P.A.3
  • 26
    • 48249150837 scopus 로고    scopus 로고
    • Environmental impact and added value in forestry operations in Norway
    • Michelsen O., Solli C., Strømman A.H. Environmental impact and added value in forestry operations in Norway. J Ind Ecol 2008, 12:69-81.
    • (2008) J Ind Ecol , vol.12 , pp. 69-81
    • Michelsen, O.1    Solli, C.2    Strømman, A.H.3
  • 27
    • 14944344669 scopus 로고    scopus 로고
    • Greenhouse gas emissions from final harvest fuel chip production in Finland
    • Wihersaari M. Greenhouse gas emissions from final harvest fuel chip production in Finland. Biomass Bioenergy 2005, 28:435-443.
    • (2005) Biomass Bioenergy , vol.28 , pp. 435-443
    • Wihersaari, M.1
  • 28
    • 84884206985 scopus 로고    scopus 로고
    • Life cycle primary energy use and carbon footprint of wood-frame conventional and passive houses with biomass-based energy supply
    • Dodoo A., Gustavsson L. Life cycle primary energy use and carbon footprint of wood-frame conventional and passive houses with biomass-based energy supply. Appl Energy 2013, 112:834-842.
    • (2013) Appl Energy , vol.112 , pp. 834-842
    • Dodoo, A.1    Gustavsson, L.2
  • 29
    • 79951578249 scopus 로고    scopus 로고
    • Attributional life cycle assessment of woodchips for bioethanol production
    • Neupane B., Halog A., Dhungel S. Attributional life cycle assessment of woodchips for bioethanol production. J Clean Prod 2011, 19:733-741.
    • (2011) J Clean Prod , vol.19 , pp. 733-741
    • Neupane, B.1    Halog, A.2    Dhungel, S.3
  • 31
    • 84880290591 scopus 로고    scopus 로고
    • A systematic review of bioenergy life cycle assessments
    • Muench S., Guenther E. A systematic review of bioenergy life cycle assessments. Appl Energy 2013, 112:257-273.
    • (2013) Appl Energy , vol.112 , pp. 257-273
    • Muench, S.1    Guenther, E.2
  • 32
    • 84861185470 scopus 로고    scopus 로고
    • Characteristic fuel consumption and exhaust emissions in fully mechanized logging operations
    • Klvac R., Skoupy A. Characteristic fuel consumption and exhaust emissions in fully mechanized logging operations. J For Res 2009, 14:328-334.
    • (2009) J For Res , vol.14 , pp. 328-334
    • Klvac, R.1    Skoupy, A.2
  • 33
    • 84867455703 scopus 로고    scopus 로고
    • Life cycle assessment (LCA) in forestry - state and perspectives
    • Heinimann H.R. Life cycle assessment (LCA) in forestry - state and perspectives. Croation J For Eng 2012, 33:357-372.
    • (2012) Croation J For Eng , vol.33 , pp. 357-372
    • Heinimann, H.R.1
  • 34
    • 80053297148 scopus 로고    scopus 로고
    • Greenhouse gas balance of harvesting stumps and logging residues for energy in Sweden
    • Lindholm E.-L., Stendahl J., Berg S., Hansson P.-A. Greenhouse gas balance of harvesting stumps and logging residues for energy in Sweden. Scand J For Res 2011, 26:586-594.
    • (2011) Scand J For Res , vol.26 , pp. 586-594
    • Lindholm, E.-L.1    Stendahl, J.2    Berg, S.3    Hansson, P.-A.4
  • 35
    • 79961154437 scopus 로고    scopus 로고
    • Bioenergy from mountain forest: a life cycle assessment of the Norwegian woody biomass supply chain
    • Valente C., Hillring B.G., Solberg B. Bioenergy from mountain forest: a life cycle assessment of the Norwegian woody biomass supply chain. Scand J For Res 2011, 26:429-436.
    • (2011) Scand J For Res , vol.26 , pp. 429-436
    • Valente, C.1    Hillring, B.G.2    Solberg, B.3
  • 36
    • 84865299785 scopus 로고    scopus 로고
    • Sustainability impact assessment of increasing resource use intensity in forest bioenergy production chains
    • Werhahn-Mees W., Palosuo T., Garcia-Gonzalo J., RÖSer D., Lindner M. Sustainability impact assessment of increasing resource use intensity in forest bioenergy production chains. GCB Bioenergy 2011, 3:91-106.
    • (2011) GCB Bioenergy , vol.3 , pp. 91-106
    • Werhahn-Mees, W.1    Palosuo, T.2    Garcia-Gonzalo, J.3    RÖSer, D.4    Lindner, M.5
  • 37
    • 81555219216 scopus 로고    scopus 로고
    • Energy and greenhouse gas balance of the use of forest residues for bioenergy production in the UK
    • Whittaker C., Mortimer N., Murphy R., Matthews R. Energy and greenhouse gas balance of the use of forest residues for bioenergy production in the UK. Biomass Bioenergy 2011, 35:4581-4594.
    • (2011) Biomass Bioenergy , vol.35 , pp. 4581-4594
    • Whittaker, C.1    Mortimer, N.2    Murphy, R.3    Matthews, R.4
  • 38
    • 84861440913 scopus 로고    scopus 로고
    • LCA of cropping systems with different external input levels for energetic purposes
    • Goglio P., Bonari E., Mazzoncini M. LCA of cropping systems with different external input levels for energetic purposes. Biomass Bioenergy 2012, 42:33-42.
    • (2012) Biomass Bioenergy , vol.42 , pp. 33-42
    • Goglio, P.1    Bonari, E.2    Mazzoncini, M.3
  • 39
    • 79951671910 scopus 로고    scopus 로고
    • Life cycle assessment of Swiss farming systems: I. Integrated and organic farming
    • Nemecek T., Dubois D., Huguenin-Elie O., Gaillard G. Life cycle assessment of Swiss farming systems: I. Integrated and organic farming. Agric Syst 2011, 104:217-232.
    • (2011) Agric Syst , vol.104 , pp. 217-232
    • Nemecek, T.1    Dubois, D.2    Huguenin-Elie, O.3    Gaillard, G.4
  • 40
    • 84864818006 scopus 로고    scopus 로고
    • LCA of biomass-based energy systems: a case study for Denmark
    • Tonini D., Astrup T. LCA of biomass-based energy systems: a case study for Denmark. Appl Energy 2012, 99:234-246.
    • (2012) Appl Energy , vol.99 , pp. 234-246
    • Tonini, D.1    Astrup, T.2
  • 41
    • 84889568045 scopus 로고    scopus 로고
    • Energy value of forest residue bundles. COST FP0902 Short Term Scientific Missions Report: University of Florence;
    • Neri F. Energy value of forest residue bundles. COST FP0902 Short Term Scientific Missions Report: University of Florence; 2010. p. 14.
    • (2010) , pp. 14
    • Neri, F.1
  • 42
    • 85021210148 scopus 로고    scopus 로고
    • Seedling production data Ireland;
    • Doyle M. Seedling production data Ireland; 2012.
    • (2012)
    • Doyle, M.1
  • 43
    • 0036466435 scopus 로고    scopus 로고
    • Life cycle inventory of forest seedling production - from seed to regeneration site
    • Aldentun Y. Life cycle inventory of forest seedling production - from seed to regeneration site. J Clean Prod 2002, 10:47-55.
    • (2002) J Clean Prod , vol.10 , pp. 47-55
    • Aldentun, Y.1
  • 44
    • 84889568675 scopus 로고    scopus 로고
    • Economic benefits and guidelines for planting improved Washington Sitka spruce. Coford Connects Notes;
    • Phillips H, Thompson D. Economic benefits and guidelines for planting improved Washington Sitka spruce. Coford Connects Notes; 2010.
    • (2010)
    • Phillips, H.1    Thompson, D.2
  • 45
    • 84889577728 scopus 로고    scopus 로고
    • Fuel consumption in Irish forestry operations - personal communication;. p. Personal communication.
    • Lyons J. Fuel consumption in Irish forestry operations - personal communication; 2012. p. Personal communication.
    • (2012)
    • Lyons, J.1
  • 46
    • 85021190870 scopus 로고    scopus 로고
    • Life cycle inventories of building products. Final report ecoinvent data v2.0 No. 7. Dübendorf, CH: Swiss Centre for Life Cycle Inventories;
    • Kellenberger D, Althaus H-J, Künniger T, Lehmann M, Jungbluth N, Thalmann P. Life cycle inventories of building products. Final report ecoinvent data v2.0 No. 7. Dübendorf, CH: Swiss Centre for Life Cycle Inventories; 2007.
    • (2007)
    • Kellenberger, D.1    Althaus, H.-J.2    Künniger, T.3    Lehmann, M.4    Jungbluth, N.5    Thalmann, P.6
  • 47
    • 85021227238 scopus 로고    scopus 로고
    • In: Murphy F, editor. Forestry operations;
    • Brennan A. In: Murphy F, editor. Forestry operations; 2012.
    • (2012)
    • Brennan, A.1
  • 48
    • 84889562281 scopus 로고    scopus 로고
    • Stump harvesting biomass estimates on 5 conifer trial sites in Ireland
    • Jyväskylä, Finland
    • Coates E., Kent T., Horgan B. Stump harvesting biomass estimates on 5 conifer trial sites in Ireland. Bioenergy 2013 2013, Jyväskylä, Finland.
    • (2013) Bioenergy 2013
    • Coates, E.1    Kent, T.2    Horgan, B.3
  • 49
    • 85021241796 scopus 로고    scopus 로고
    • Coleman. In: Murphy F, editor. Shredder fuel consumption;
    • Coleman. In: Murphy F, editor. Shredder fuel consumption; 2013.
    • (2013)
  • 50
    • 84876993651 scopus 로고    scopus 로고
    • 2 emissions of biomass based haulage in Ireland - a case study
    • 2 emissions of biomass based haulage in Ireland - a case study. Energy 2013, 54:55-62.
    • (2013) Energy , vol.54 , pp. 55-62
    • Devlin, G.1    Klvac, R.2    McDonnell, K.3
  • 51
    • 84889569586 scopus 로고    scopus 로고
    • Technology aids value recovery
    • Murphy G. Technology aids value recovery. Focus Foresty 2005, 18.
    • (2005) Focus Foresty , pp. 18
    • Murphy, G.1
  • 52
    • 79751502037 scopus 로고    scopus 로고
    • Industrial round-wood losses associated with harvesting systems in Russia
    • Gerasimov Y., Seliverstov A. Industrial round-wood losses associated with harvesting systems in Russia. Croation J For Eng 2010, 31:111-126.
    • (2010) Croation J For Eng , vol.31 , pp. 111-126
    • Gerasimov, Y.1    Seliverstov, A.2
  • 53
    • 85021246210 scopus 로고    scopus 로고
    • COFORD. GROWFOR - Irish Dynamic Yield Models;
    • COFORD. GROWFOR - Irish Dynamic Yield Models; 2006.
    • (2006)
  • 55
    • 84858852753 scopus 로고    scopus 로고
    • Energy use indicators in energy and life cycle assessments of biofuels: review and recommendations
    • Arvidsson R., Fransson K., Fröling M., Svanström M., Molander S. Energy use indicators in energy and life cycle assessments of biofuels: review and recommendations. J Clean Prod 2012, 31:54-61.
    • (2012) J Clean Prod , vol.31 , pp. 54-61
    • Arvidsson, R.1    Fransson, K.2    Fröling, M.3    Svanström, M.4    Molander, S.5
  • 57
    • 84889581716 scopus 로고    scopus 로고
    • Pure energy ratio of logging residua processing. In: Formec - 44th international symposium on forestry mechanisation. Graz, Austria;
    • Klvac R. Pure energy ratio of logging residua processing. In: Formec - 44th international symposium on forestry mechanisation. Graz, Austria; 2011.
    • (2011)
    • Klvac, R.1
  • 58
    • 84889571270 scopus 로고    scopus 로고
    • ISO 14044. Environmental management - life cycle assessment - requirements and guidelines;
    • ISO 14044. Environmental management - life cycle assessment - requirements and guidelines; 2006.
    • (2006)
  • 59
    • 84889587039 scopus 로고    scopus 로고
    • Kofman PD. Units, conversion factors and formulae for wood for energy. COFORD Connects - Harvesting/Transprtation No212010.
    • Kofman PD. Units, conversion factors and formulae for wood for energy. COFORD Connects - Harvesting/Transprtation No212010.
  • 60
    • 84879211392 scopus 로고    scopus 로고
    • The influence of forest management systems on the environmental impacts for Douglas-fir production in France
    • González-García S., Bonnesoeur V., Pizzi A., Feijoo G., Moreira M.T. The influence of forest management systems on the environmental impacts for Douglas-fir production in France. Sci Total Environ 2013, 461-462:681-692.
    • (2013) Sci Total Environ , pp. 681-692
    • González-García, S.1    Bonnesoeur, V.2    Pizzi, A.3    Feijoo, G.4    Moreira, M.T.5
  • 61
    • 84889580858 scopus 로고    scopus 로고
    • Procurement costs of slash and stumps in Sweden - a comparison between south and north Sweden
    • Jönköping, Sweden
    • Athanassiadis D., Lundström A., Nordfjell T. Procurement costs of slash and stumps in Sweden - a comparison between south and north Sweden. World Bioenergy 2010 2010, Jönköping, Sweden.
    • (2010) World Bioenergy 2010
    • Athanassiadis, D.1    Lundström, A.2    Nordfjell, T.3
  • 62
    • 84885912719 scopus 로고    scopus 로고
    • Deriving cooperative biomass resource transport supply strategies in meeting co-firing energy regulations: a case for peat and wood fibre in Ireland
    • Devlin G., Talbot B. Deriving cooperative biomass resource transport supply strategies in meeting co-firing energy regulations: a case for peat and wood fibre in Ireland. Appl Energy 2014, 113:1700-1709.
    • (2014) Appl Energy , vol.113 , pp. 1700-1709
    • Devlin, G.1    Talbot, B.2
  • 63
    • 77957298271 scopus 로고    scopus 로고
    • 2 benefits of recovering, refining and transporting logging residues for fossil fuel replacement
    • 2 benefits of recovering, refining and transporting logging residues for fossil fuel replacement. Appl Energy 2011, 88:192-197.
    • (2011) Appl Energy , vol.88 , pp. 192-197
    • Gustavsson, L.1    Eriksson, L.2    Sathre, R.3
  • 64
    • 84873731042 scopus 로고    scopus 로고
    • The effects of local biomass availability and possibilities for truck and train transportation on the greenhouse gas emissions of a small-diameter energy wood supply chain
    • Jäppinen E., Korpinen O.J., Ranta T. The effects of local biomass availability and possibilities for truck and train transportation on the greenhouse gas emissions of a small-diameter energy wood supply chain. BioEnergy Res 2013, 6:166-177.
    • (2013) BioEnergy Res , vol.6 , pp. 166-177
    • Jäppinen, E.1    Korpinen, O.J.2    Ranta, T.3
  • 65
    • 77951025858 scopus 로고    scopus 로고
    • 2- and primary energy balances of forest-fuel recovery systems at different forest productivity
    • 2- and primary energy balances of forest-fuel recovery systems at different forest productivity. Biomass Bioenergy 2010, 34:610-619.
    • (2010) Biomass Bioenergy , vol.34 , pp. 610-619
    • Eriksson, L.1    Gustavsson, L.2
  • 67
    • 84908053189 scopus 로고    scopus 로고
    • Energy requirements and environmental impacts associated with the production of short rotation willow (Salix sp.) chip in Ireland
    • [Advance online, publication]
    • Murphy F., Devlin G., McDonnell K. Energy requirements and environmental impacts associated with the production of short rotation willow (Salix sp.) chip in Ireland. GCB Bioenergy 2013, [Advance online, publication]. 10.1111/gcbb.1211.
    • (2013) GCB Bioenergy
    • Murphy, F.1    Devlin, G.2    McDonnell, K.3
  • 68
    • 84876137020 scopus 로고    scopus 로고
    • Miscanthus production and processing in Ireland: an analysis of energy requirements and environmental impacts
    • Murphy F., Devlin G., McDonnell K. Miscanthus production and processing in Ireland: an analysis of energy requirements and environmental impacts. Renew Sust Energy Rev 2013, 23:412-420.
    • (2013) Renew Sust Energy Rev , vol.23 , pp. 412-420
    • Murphy, F.1    Devlin, G.2    McDonnell, K.3
  • 69
    • 85021207552 scopus 로고    scopus 로고
    • Kohle. Final report ecoinvent No. 6. Dübendorf, CH: Paul Scherrer Institut Villigen, Swiss Centre for Life Cycle Inventories;
    • Dones R, Bauer C, Röder A. Kohle. Final report ecoinvent No. 6. Dübendorf, CH: Paul Scherrer Institut Villigen, Swiss Centre for Life Cycle Inventories; 2007.
    • (2007)
    • Dones, R.1    Bauer, C.2    Röder, A.3


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