Teacher editor

TimetableDesigner.Core/TimetableSpansCollision.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace TimetableDesigner.Core
+{
+    internal enum TimetableSpansCollision
+    {
+        CheckedSlotBefore,
+        CheckedSlotAfter,
+        CheckedSlotIn,
+        CheckedSlotFromIn,
+        CheckedSlotToIn
+    }
+}