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Write down the numbers of the topic sentences in the following passages.
①Californians and New Englanders are both American. ②They speak the same language and abide by the same federal laws. ③But they are very different in their ways of life. Mobility --- both physical and psychological--- has made a great impression on the culture of Californians; ④lack of mobility is the mark of the customs and morality of New Englanders.
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