15.6 15.7 text

[Sandy Garner]

First 2 sentences 15.7 also useful text for 15.6

15.6 By unordered, it means a set is not indexed. But things are listed in an orderly fashion, sometimes.

Need more set examples in 15.6 that aren't char e.g.
set(['a', 'list', 'of', 'words'])
set([2,8,90,1,0])
set([2,8,8,8,2])
set([20.5,100, 3.45])