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Update README.md

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@@ -168,7 +168,7 @@ The reviews were written by undergraduate students (typically aged 18–21, thou
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  #### Annotation process
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- Aspects were identified using keyword searches across the review corpus. Relevant keywords and synonyms were grouped into unified aspects. Each aspect was assigned one of the sentiment classes based on the following:
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  * **Positive**: a positive opinion expressed
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  * **Neutral**: the aspect is mentioned, but no clear opinion or a mixed one is expressed
 
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  #### Annotation process
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+ Aspects were identified using keyphrase extraction across the review corpus. Relevant keywords were grouped into unified aspects. Each aspect was assigned one of the sentiment classes based on the following:
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  * **Positive**: a positive opinion expressed
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  * **Neutral**: the aspect is mentioned, but no clear opinion or a mixed one is expressed