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Once upon a time a teacher and his student lay down under a big tree near the big grass area.Then ...

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at that moment    for the time being    at once    at the same time  
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very often  in a time  once upon a time  once in a while  
once and for all    once upon a time    once in a while    all at once  
the first time  for the first time   from time to time  once upon a time  
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