Please identify the elements from the list that are commonly associated with web addresses.

Web Address Components:

Based on the provided lists, the elements commonly associated with web addresses are:

• http.
• //
• .com

Items like 'book' and 'txt' are general words and not specific components of a URL. The ordering of these elements also varies across the different lists, but their presence indicates a connection to web addresses.

Answer: http., //, .com