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"1"
Jane 22 years old learning period:5 monthsStarted from pinyin
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"2"
Lily 15 years old learning perid:12 monthsStarted from the very beginning
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"3"
Mike 15 years old learning period:15 monthsStarted from pinyin
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"4"
Jesse 23 years old learning period:2 monthsStarted from the very beginning
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"5"
William 33 years old learning period:6 monthsStarted from the very beginning
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"6"
Sherry 19 years old learning period:5 monthsStarted from listening and speaking strengthening
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