All the options listed can contribute to a text having multiple perspectives:
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If the text has additional facts - More facts can provide a broader context and different viewpoints.
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If the text covers a difficult topic - Difficult topics often have various interpretations and viewpoints, leading to multiple perspectives.
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If the text has more than one author - Different authors can bring their unique insights and experiences, creating multiple perspectives.
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If the text contains a deep understanding - A deep understanding of a subject can reveal complexities and nuances, leading to multiple perspectives.
So, any of these factors can contribute to a text having multiple perspectives.