$ java -jar ursa.jar
cygnus/x ursa v0.76 (default, release 1)
[Oracle Corporation JVM 1.8.0_91 on Linux 3.16.0-4-686-pae i386]
> def f (string s1, string s2, string sep)
..	return (+ s1 sep sep s2)
..end
> out (f "Rosetta" "Code" ":") endl console
Rosetta::Code
> _