This is a basic question related to Smalltalk programming language. Please give the correct solution and not copied from another source or else you'll get a downvote.

Write a Smalltalk script in the playground that instantiates an empty OrderedCollection object, generates 20 random integers between 0 and 15 (inclusive), and adds those integers to the OrderedCollection. You should then print the contents of the OrderedCollection, as well as the number of unique elements in the OrderedCollection. Hint: Smalltalk has a class called Random which implements the function next. It returns a number in the range [l 01]