Minecraft wiki entry for Village_chaining, associated text: 1 Classifications
1.1 Non-Concentrical and Concentrical
1.1.1 Comparing the non-concentrical version to the concentrical version
1.2 Non-Resettable and Resettable
2 Game mechanics and mechanisms used in village chaining
2.1 Village merging priority & Border extender
2.1.1 Border extender
2.2 Properties of the village center & Center anchor
2.2.1 Center anchor
2.3 One villager in multiple villages
2.4 House detection mechanics & Layered chained village + Keeping doors detected + Undetecting a door
2.4.1 Layered chained village + Keeping doors detected + Undetecting a door
2.5 The downward preference