[texhax] writing about 2 parallel developments of a product with the same base code

[Vaida Bogdan]

Hi, can someone tell me how can I write 2 documents that have 90% of
the content the same, the rest 10% modified, some sections added, some
modified and some deleted?
Basically I need to write about 2 parallel developments of a product
with the same base code.

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