14
.0.1.....0...1
0.....0.......
.0..0.0...0..1
0..1...0......
..1.1...0.1.1.
0....0..10....
..1...0.....1.
.1..0....0...0
00..0......0.1
11...1...0..1.
...1...1.11...
.00..1...1....
.....1.....01.
0...0.....1.1.

source: https://www.facebook.com/TUDelft.TI/photos/a.231078486949376.55913.192869650770260/1149387395118476/?type=3