Although closely connected to the misconception that high exposure events are more likely than less conspicuous events, the heuristic of availability is a more general misconception. Many people believe that events that are easier for their mind to list are more numerous than events that require longer thought processes to list. For example, listing all the possible pairs of digits, where order is not important, is a relatively easy thing for the mind to handle. Once you have developed an organized strategy for listing the pairs, you can rattle them off with no problem. However, groups of eight numbers are a little trickier for your mind to develop a system to list. As a result, many people think that they are having a hard time listing them because there are less of them. This is, in fact, not true. There happen to be an equal number of groups of 2 digits and 8 digits.