Hi! Type: (1 to: 20) shuffled and an error is raised. I have fixed this. Check: https://pharo.fogbugz.com/f/cases/17233/Interval-cannot-be-shuffled Cheers, Alexandre -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.