I wanted to put up a difficult contest for a change, but I hope I did not make it too hard.
There were two correct entries before the hint was out: kudos to hhgygy and Chris Nason for getting it without help. Maybe you want to share with us how you found it.
All the correct answers were from:
- Chris Nason
- Andy McConnell
- Milosh, Serbia
- David Kozina
- Javier Abadia
- José Miguel Díaz