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I like golfing in tinylisp: (d M(q((x)(i x(i(disp x)0(M x))0 But I also like posting explanations with nicely formatted code: ...

Create a program or function to unjumble a 9x9x9 cube of digits by rotating individual 3x3 cubes within it. This is similar to (but, I suspect, a bit harder than) my Flippin' Squares question. Input ...

Given a POSIX Extended Regular Expression as input, output its complement (also a POSIX ERE). If the given regular expression matches a string, its complement should not match it, and the regex: ...