The article doesn't explain what distinguishes a gravitational singularity from a mathematical singularity in GR equations. I put "sometimes" but someone took it away.
Here's the diff: mathematical singularities don't *always* means gravitational singularities because they can be artifacts of the coordinate system used.
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An extensive overseas sales effort has so far yielded just one firm order, 60 aircraft for Greece; with an order for 24 units from Austria pending.
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