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SETTING
.GEOGRAPHY
   .Region
   .Macro-region
   :Natural resources
        obsidian
        .limestone
   Environment
   Weather
   Temperature/humidity
   :Perceptual geography
.CHRONOLOGY
    .Principles
    .Relative
    .Absolute
    Synoptic
PERIODS
    ;Cultural boundaries
    Periods
    ."Longue durée"
    .Ethnic solidarities