A variable with ? vs a variable with an ?

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a variable with ? is the most popular phrase on the web. 

a variable with an ?

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a variable with ?

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Some examples and use cases from the internet:

Some examples and use cases from the internet:
  • It doesn't look like this phrase is very popular! The search could not find any examples on the internet.
  • The square of a variable with ? = 1, for instance, is denoted by (x1)2. In this paper all tensor products ? are tensor products over the ground field K. Date: April 28 ...

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