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+Items traveling through tubes will prefer to take paths of higher priority.
+The routing decision is being made for each tube segement.
+
+Node/Group             | Priority
+---------------------- | -------------
+Default for all Tubes  | 50
+One-Way Tube           | 75
+(High) Priority Tube   | 150
+Trashcan               | 1
+Inventories and Tubedevices | 100
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