If you take a town, you can understand that it can be divided into north, south, east and west; it can be divided into districts and quarters, and then divided into different streets. It can also be studied from the point of view of its population, for it has people of different nationalities, people of different professions, belonging to different classes and so on. None of these divisions will coincide with one another, each must be studied separately. You cannot make a general map, including them all— you must make a series of different maps

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