Make reason of prenatal code visible.

Code is commented since ages, the reason is missing (because there is a reason).
merged branch hakre/patch-1 (PR #600)

This PR was merged into the master branch.

Commits
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9468509 Make reason of prenatal code visible.

Discussion
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Make reason of prenatal code visible.

Code is commented since ages, the reason is missing (because there is a reason).

See #594