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The world is very complicated, full of phenomena, facts and various viewpoints (insights, lies and deception). We need to extract the consistency behind them in order to quickly understand and understand the world. This consistency is the dimension in the classification. The classification of the three worlds is just to find a classification method for countries that we have not used before. The traditional classification of countries is based on geographical location (five continents), population (large and small countries) and development stage, while the three worlds are classified according to their relationship.The only use of * * is probably that I can't remember the name of the medicine when writing the plot of the Potions lesson * *太麻烦了，咱们还是下五子棋吧。6. Requirements for Silk Screen Printing and Solder Resistance知道不？到了战场上，可别指望老大救你。