Isothermal and nonisothermal gravimetry of nontronite dehydroxylation |
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Authors: | N S Felix B S Girgis |
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Institution: | (1) CMRDI, and National Research Centre, Dokki, Cairo, Egypt |
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Abstract: | A pure typical nontronite from Czechoslovakia (Sampor) was analysed by the title techniques in the range 570–1070 K. The isothermal dehydroxylation of nontronite, recorded at 630–730 K, was described reasonably, in the decomposition range =0.05–0.95, by diffusioncontrolled mechanismsD
3 andD
4. Application of the current solid-state reaction equations to the non-isothermal curve gave very poor results, except in the limited decomposition range =0.10 to 0.55. A unimolecular mechanism equation (Fm
1) and also a second-order (SO) mechanism gave the best linearization of the curve. The activation energies estimated from the isothermal (D
3,D
4) and non-isothermal (F
1) experiments were 125 and 151 kJ·mol–1, respectively. Reduced time plots indicate the probable presence of a sequence of different mechanism for both techniques.
Zusammenfassung Mittels der Titeltechniken wurde im Bereich 570–1070 K ein reines typisches Nontronit aus der SSR (Sampor) untersucht. Die isotherme Dehydroxylierung von Nontronit bei 630–730 K konnte im Bereich der Zersetzung von =0,05–0,95 durch die diffusionsbestimmten MechanismenD
3 undD
4 befriedigend beschrieben werden. Eine Anwendung der Gleichungen für Feststoffreaktionen auf die nichtisotherme Kurve ergab mit Ausnahme des Bereiches =0,10–0,55 nur sehr unzureichende Ergebnisse. Eine Gleichung für einen monomolekularen (F
1) Mechanismus sowie für einen mechanismus zweiter Ordnung (SO) ergaben die beste Linearisierung der Kurve. Die aufgrund der isothermen (D
3,D
4) und nichtisothermen (F
1) Experimente geschätzten Aktivierungsenergien betragen 125 bzw. 151 kJ·mol–1. Es wird angenommen, daß es sich bei beiden Techniken um eine Sequenz verschiedener Mechanismen handelt.
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3 D
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![shchcy](/content/h26713g621652657/xxlarge1097.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![softcy](/content/h26713g621652657/xxlarge1100.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ycy](/content/h26713g621652657/xxlarge1099.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![tscy](/content/h26713g621652657/xxlarge1094.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![pcy](/content/h26713g621652657/xxlarge1087.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![pcy](/content/h26713g621652657/xxlarge1087.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![khcy](/content/h26713g621652657/xxlarge1093.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![ucy](/content/h26713g621652657/xxlarge1091.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![softcy](/content/h26713g621652657/xxlarge1100.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) , ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![yucy](/content/h26713g621652657/xxlarge1102.gif) ![chcy](/content/h26713g621652657/xxlarge1095.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ucy](/content/h26713g621652657/xxlarge1091.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![bcy](/content/h26713g621652657/xxlarge1073.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) =0,10–0,55. ![Pcy](/content/h26713g621652657/xxlarge1055.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![ucy](/content/h26713g621652657/xxlarge1091.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![yacy](/content/h26713g621652657/xxlarge1103.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![gcy](/content/h26713g621652657/xxlarge1075.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![khcy](/content/h26713g621652657/xxlarge1093.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![tscy](/content/h26713g621652657/xxlarge1094.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) (F
1), ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![zhcy](/content/h26713g621652657/xxlarge1078.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![tscy](/content/h26713g621652657/xxlarge1094.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![gcy](/content/h26713g621652657/xxlarge1075.gif) ![pcy](/content/h26713g621652657/xxlarge1087.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![ucy](/content/h26713g621652657/xxlarge1091.gif) ![chcy](/content/h26713g621652657/xxlarge1095.gif) ![shchcy](/content/h26713g621652657/xxlarge1097.gif) ![ucy](/content/h26713g621652657/xxlarge1091.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![tscy](/content/h26713g621652657/xxlarge1094.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) . ![Ecy](/content/h26713g621652657/xxlarge1069.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![gcy](/content/h26713g621652657/xxlarge1075.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![tscy](/content/h26713g621652657/xxlarge1094.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) , ![ucy](/content/h26713g621652657/xxlarge1091.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ycy](/content/h26713g621652657/xxlarge1099.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![chcy](/content/h26713g621652657/xxlarge1095.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) (D
3,D
4) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![chcy](/content/h26713g621652657/xxlarge1095.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) (F
1) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) , ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![yacy](/content/h26713g621652657/xxlarge1103.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) , ![scy](/content/h26713g621652657/xxlarge1089.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) , 125 151 ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ·![mcy](/content/h26713g621652657/xxlarge1084.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) –1. ![Pcy](/content/h26713g621652657/xxlarge1055.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ycy](/content/h26713g621652657/xxlarge1099.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ycy](/content/h26713g621652657/xxlarge1099.gif) ![gcy](/content/h26713g621652657/xxlarge1075.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![fcy](/content/h26713g621652657/xxlarge1092.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![pcy](/content/h26713g621652657/xxlarge1087.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![kcy](/content/h26713g621652657/xxlarge1082.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![zhcy](/content/h26713g621652657/xxlarge1078.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![chcy](/content/h26713g621652657/xxlarge1095.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![pcy](/content/h26713g621652657/xxlarge1087.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![vcy](/content/h26713g621652657/xxlarge1074.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![softcy](/content/h26713g621652657/xxlarge1100.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![scy](/content/h26713g621652657/xxlarge1089.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![rcy](/content/h26713g621652657/xxlarge1088.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![chcy](/content/h26713g621652657/xxlarge1095.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![ycy](/content/h26713g621652657/xxlarge1099.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![khcy](/content/h26713g621652657/xxlarge1093.gif) ![acy](/content/h26713g621652657/xxlarge1072.gif) ![ncy](/content/h26713g621652657/xxlarge1085.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![zcy](/content/h26713g621652657/xxlarge1079.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ![lcy](/content/h26713g621652657/xxlarge1083.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![bcy](/content/h26713g621652657/xxlarge1073.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![icy](/content/h26713g621652657/xxlarge1080.gif) ![mcy](/content/h26713g621652657/xxlarge1084.gif) ![iecy](/content/h26713g621652657/xxlarge1077.gif) ![tcy](/content/h26713g621652657/xxlarge1090.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) ![dcy](/content/h26713g621652657/xxlarge1076.gif) ![ocy](/content/h26713g621652657/xxlarge1086.gif) .
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