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No, you don't. Just like you don't pluralise Arabic numerals.
Answer
#3: Attribution notice added
by
System
·
2019-12-08T06:34:03Z (almost 5 years ago)
Source: https://writers.stackexchange.com/a/28432 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
by
SC for reinstatement of Monica
·
2019-12-08T06:34:03Z (almost 5 years ago)
No, you don't. Just like you don't pluralise Arabic numerals.
#1: Imported from external source
by
System
·
2017-06-02T17:12:44Z (over 7 years ago)
Original score: 1