Why does the definite article "o" sometimes come before the "que"?

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Why is German called "Deutsch" in German, while Dutch is called "Niederländer"? Why do some Romance languages seem to use a different root word, like "Alemán" in Spanish and "Allemand" in French?
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¿Cuál es la différencia entre "lastname" o "surname"?
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¿Cuál es la diferencia entre usar fine y good? Es válido decir: i'm good, we're good, it's fine?
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What is the Hebrew word for "they" if it is referring to a mixed gender group?
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Introduction: Jonathan Benchlouch
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What is the difference between "a" and "á" in Portuguese?
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What are some fruits and vegetables that have different names in different countries, like palta (Chile) vs aguacate (Mexico)?
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¿Cuál es la diferencia entre “Gute nacht”, “Guten abend” y “Gutenachmittag”?
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