The preceding command changes "singer" to "singer,actress" on the 2nd line below any line containing the word "Madonna", but only within the range defined by the first occurrence of a line containing "friend" and the next (after that line) occurrence of a line containing the word "lover".

You might actually use something like this to edit one of those semi-freeform hierarchical data files where lines under a header describe, sequentially, properties of that header.

Aren't you glad you asked? Me -- I program in Pascal and Perl -- so I think I'd find a more readable way to accomplish the same thing.

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