Update README.md

README.md

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 ## Dataset Description
 
-- **Homepage:**
-- **Repository:**
-- **Paper:**
-- **Leaderboard:**
-- **Point of Contact:**
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 ### Dataset Summary
 
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 ## Dataset Structure
 
+1. numero: CAES phrase number, starting at 1 and up to the number of retrieved phrases.
+2. nivel: Level of knowledge of Spanish by the student who has provided the phrase. It will be one of those established in the Common European Framework of Reference in the learning of foreign languages
+3. lengua materna: Mother tongue of the Spanish student to which the registered phrase belongs.
+4. palabra clave: Key Word or Element in the phrase. As indicated, it can be a word, a punctuation mark or any other element or character that determines the critical aspect or main element of the compiled phrase.
+5. frase: Complete phrase provided by the Spanish student. It is made up of the concatenation of the two parts into which it has been segmented in the source files, also including the word or key element.
+6. nombre archivo origen: Also included in the dataset, in order to be able to use it in the preprocessing of the data, is the name of the origin file of the corresponding phrase. Although this information is not necessary for the object of the work, it is of interest when debugging the data capture. Later it will be information that we can do without.
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 ### Data Instances
 
 [More Information Needed]