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I just can't workout what the difference is - one sheet is okay one just falls over.
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In the 'does not work' sheet, you have added pi as a unit to the result. It's not defined as such. Pi is a constant by default; you can (also) define it as a unit. But you have to do that yourself.
In the 'works' sheet you have added pi as an automatic variable (check label, it says '-' which means 'automatic' ). That's where Prime may find out for itself, and that apparently works.
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