Update README.md

README.md

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 # Dataset Card for PoliticalBias
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 ## Table of Contents
 - [Dataset Description](#dataset-description)
 - [Languages](#languages)
 - [Dataset Structure](#dataset-structure)
 - [Source Data](#source-data)
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 ## Dataset Description
  roughly 8200 articles written by the website’s editors, each article covering one topic with 3 links that describe the same piece of news from different angles (usually one from the right, one from the left, and one from the center)
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 ## Languages
 The text in the dataset is in English
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 ## Dataset Structure
-The dataset consists of four columns namely Left, Right, Center and Main URL
+The dataset consists of four columns namely Left, Right, Center, and Main URL
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 ## Source Data
 The dataset is scrapped from http://allsides.com/