replacing two consecutive words where the two words could be separated by multiple spaces or newlines.

[Nobuko Three]

I wanted to replace all occurrences of `a integer' with `an integer' in a
latex file. But a simple query replace would replace the first `a integer'
of the following paragraph, but not the second one because the second one is
actually separated by a newline and two spaces (the indent).


  This is a integer. That is a
  integer. ...

What is an automated way to change paragraphs like above to paragraphs like
below?

  This is an integer. That is an
  integer. ...
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