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Eukleides is decidedly not a golfing language, but when a geometry-related question came up on PPCG, I had to give it a shot. Eukleides can be quite rigid; for starters it is very strongly typed. Functions are declared by what they intend to return, so while set would be the shortest way to declare a function, it can’t really be exploited (unless returning a set is, in fact, desired). Speaking of sets, one thing that is potentially golfable is ‘casting’ a point to a set. Given a point, p, attempting a setwise operation on p will fail because a point does not automatically cast to a set (strict typing). p=set(p) will overwrite point p with a single-item set containing the point that was p. If, however, it is okay to have two copies of the point in the set, p=p.p is three bytes shorter.

If user input is required, the command number("prompt") reads a number from STDIN. The string for the prompt is required, though it can be empty (""). Thus, if more than four such inputs (or empty strings for other purposes) are required, it saves bytes to assign a variable with a one-letter name to an empty string.

Whitespace is generally unavoidable, but I did come to realize that boolean operators do not need to be preceded by whitespace if preceded by a number. So, if a==7or a==6 is perfectly valid. aor a, 7ora, 7 or6 are all invalid, however. This may be an interpreter bug, but for the time being it is an exploitable byte.

Finally, loci. Loci are akin to for-loops that automagically make sets. Unfortunately, they don’t seem to care much for referencing themselves mid-loop, which meant that I couldn’t exploit how short of a construction they are compared to manually creating a set in a for-loop.

This was a fun exercise, and just goes to show that if you poke around at any language enough, you’ll find various quirks that may prove useful given some ridiculous situation or another.