I found reading the code cleared up a lot because it's well commented and is really two functions, and a bit of boilerplate for reading/writing files. 'collect

I found reading the code cleared up a lot because it's well commented and is really two functions, and a bit of boilerplate for reading/writing files. 'collect1' collects pairs of (name, address) and puts it in a table called 'collect'. Then 'process1' finds any names and substitutes the address found in the 'collect' table.