It MIGHT be useful sometimes. For example, I don't think it's very clear
to some users how do you make a XOR operation in povray's CSG.

  Of course I made the page so general that it certainly looks very
theoretical.

-- 
main(i,_){for(_?--i,main(i+2,"FhhQHFIJD|FQTITFN]zRFHhhTBFHhhTBFysdB"[i]
):_;i&&_>1;printf("%s",_-70?_&1?"[]":" ":(_=0,"\n")),_/=2);} /*- Warp -*/

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