The term 'WHEN PURCHASED ALONE' can be broken down into four separate words, EACH with four letters. The first word is 'WHEN, ' which is used to refer to a specific point in time. The second word is 'PURCHASED, ' which means to acquire something through the exchange of money or other value. The third word is 'ALONE, ' which means without the company of others. Finally, the fourth word is 'ALONE, ' which is used to emphasize that something is done without the help of anyone else. Together, these four words form the phrase 'WHEN PURCHASED ALONE, ' which is used to describe a situation where an item is bought without any assistance from another person.