A plural noun indicates that there is more than one of that noun (while a singular noun indicates that there is just one of the noun). ... Regular plurals follow this rule (and other similar rules), but irregular plurals are, well, not regular and don't follow a “standard” rule.
Answer: aside
Explanation: an aside is an event that happens in a play where the audience knows something the characters do not.
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it is the cause because google said so.