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Odd space in output

From: Morten Bo Johansen
Subject: Odd space in output
Date: Thu, 2 Jan 2020 19:54:12 +0100
User-agent: slrn/1.0.3 (Linux)

Sorry for the only partially descriptive subject ...but if I do

   parallel echo ::: {a..b} ::: {a..b}
to get some permutations of the letters a-b, then the output

  a a
  a b
  b a
  b b

I know tr -d ' ' but why the space between the letters?

"So little time, so little to do." (Oscar Levant)

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