We think of an island inhabited by rogues and knights.
Rogues are always lying, knights always speak the truth.
One day 12 islanders come together among which is at least one knight and at least one rogue.
2 of them say: "Exactly 2 of us 12 are rogues".
4 of the remaining ones say:" Exactly 4 among us 12 are rogues."
And the remaining 6 say:" Exactly 6 among us 12 are rogues."
How many of these 12 are actually rogues?