Under Built-in Types in the Library documentation the section on "Sequence 
Types" begins with the paragraph:

There are five sequence types: strings, byte sequences, byte arrays, 
lists, tuples, and range objects. (For other containers see the built-in 
dict, list, set, and tuple classes, and the collections module.)

list and tuple "classes" shouldn't be in that second sentence, should 
they? They are already in the first.