While he is surfing the internet, Jonah stumbles upon a "hackers" website that is part of a ring of thirteen; each site linking to the next one, until returning to the first.
Curiously one of them requires a password and as he cycles through the front pages of the other twelve, Jonah notices some strange figures in the bottom right corner. It is not obvious, because each time the web page designer has chosen a color only slightly different to the background.
Jonah observes that the password protected site is the last in the ring, so he writes down the codes from each of the other sites sequentially to form a string as follows:
After a bit of effort, Jonah subsequently unlocks the password.
Can you do the same?