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Update README.md

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@@ -39,6 +39,10 @@ This dataset is a combination of data from various reputable sources, each contr
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  ## Usage
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  This dataset can be used for pre-training language models on financial tweets.
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  ## Acknowledgements
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  We extend our heartfelt gratitude to all the authors and contributors of the original datasets. Their efforts in data collection and curation have been pivotal in creating this comprehensive resource.
 
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  ## Usage
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  This dataset can be used for pre-training language models on financial tweets.
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+ ## Pre-processing Steps
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+ Originally the combined datasets consist of 9,336,675 rows. However, there are some duplicates and not useful tweets in there. The dataset has been cleaned of `t.co` URLs, duplicate text, empty text, and tweets that end with '...'.
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+ As a result the cleaned dataset consist of 8,024,269 rows, which is the one available here.
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  ## Acknowledgements
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  We extend our heartfelt gratitude to all the authors and contributors of the original datasets. Their efforts in data collection and curation have been pivotal in creating this comprehensive resource.