The programs:

     Query, main4 and main5:

take an argument that specifies the file to read.  They also
read the standard input iterating with the user for words 
to find in the file.  
The file 'data/Alice_story' is the simple story used for queries
presented in the book

The programs:

     Basket_main, V2_Basket_main, bsk2, and scope:

Are self-contained. They write to the standard input but do no input.

