“If you need more than 3 levels of indentation, you're screwed anyway, and should fix your program.”
Linus Torvalds (1969) Finnish-American software engineer and hacker
Linux 1.3.53 CodingStyle documentation, 2011-08-13, 1995 https://www.kernel.org/doc/Documentation/process/coding-style.rst, <br class="br">1990s, 1995-99