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				@@ -15,7 +15,7 @@ namespace Emby.Naming.AudioBook 
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				         /// <param name="files">List of files composing the actual audiobook.</param> 
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				         /// <param name="extras">List of extra files.</param> 
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				         /// <param name="alternateVersions">Alternative version of files.</param> 
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				-        public AudioBookInfo(string name, int? year, List<AudioBookFileInfo> files, List<AudioBookFileInfo> extras, List<AudioBookFileInfo> alternateVersions) 
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				+        public AudioBookInfo(string name, int? year, IReadOnlyList<AudioBookFileInfo> files, IReadOnlyList<AudioBookFileInfo> extras, IReadOnlyList<AudioBookFileInfo> alternateVersions) 
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				         { 
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				             Name = name; 
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				             Year = year; 
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				@@ -39,18 +39,18 @@ namespace Emby.Naming.AudioBook 
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				         /// Gets or sets the files. 
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				         /// </summary> 
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				         /// <value>The files.</value> 
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				-        public List<AudioBookFileInfo> Files { get; set; } 
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				+        public IReadOnlyList<AudioBookFileInfo> Files { get; set; } 
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				         /// <summary> 
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				         /// Gets or sets the extras. 
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				         /// </summary> 
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				         /// <value>The extras.</value> 
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				-        public List<AudioBookFileInfo> Extras { get; set; } 
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				+        public IReadOnlyList<AudioBookFileInfo> Extras { get; set; } 
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				         /// <summary> 
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				         /// Gets or sets the alternate versions. 
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				         /// </summary> 
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				         /// <value>The alternate versions.</value> 
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				-        public List<AudioBookFileInfo> AlternateVersions { get; set; } 
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				+        public IReadOnlyList<AudioBookFileInfo> AlternateVersions { get; set; } 
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				     } 
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				 } 
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