personal information manager or PIM software
PIM
A local telephone directory is an essential in any office, whether you work from home or in a professional setting. Fortunately, you can typically contact your local telephone company in order to acquire a free telephone directory that lists both residential and commercial telephone numbers in your local area.
In programming this could be achieved using a numeric bubble sort. Excel allows this type of sorting to be used.
Online CRM (Customer relationship management) can help you keep track of appointments with customers, manage your contact lists, and help you schedule follow-up appointments.
yellow pages
yellow pages
yellow pages
Minu bar
the yellow pages...
All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. Write out the lists of factors of the numbers you want to compare. The numbers that appear on both lists are the common factors.
Those are infinite lists.
Both of those lists are infinitely long.