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[Mark Knowles]

Isn't reproducibility relevant to time, place and the nature of the item: prayers, songs, poems, stories?

The author does his/her best at the time, and after that it's out of their control. Some things stay fixed, others mutate or get lost.

Arma virumque cano...

That I fear would be the difficulty. It is hard for me to think of a text that might not have been revised. Dante?? It would have to be some classic(or even classical?) text.