Ah cool.Thanks for answering.
Have two other questions and i won´t open a new thread for that.
arcList:List<ArcWall> a list names arclist.But what means that inside <> ?
I take a look into documentation but nothing to find.Btw. the search in online docs is terrible. 
And are there a “easy to understand” explantation for lambda´s in monkey2?
I don´t know what it does.