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Mathematics
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topical problem
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this was a highly
topical problem
in the 1920s-1930s
это была чрезвычайно актуальная задача в 1920-30-х годах
this was a highly
topical problem
in the 1920s-1930s
данная задача была чрезвычайно популярной в двадцатых-тридцатых годах нашего столетия
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