For any 2 members, add their least common multiple to the set, if and only if it was not already in the set.

Continue the task until it cannot be done.

Call the result a final list.

Examples:

a. (2,4,8,16) a is a final list.

b. (2,3,4,6) will become a final list once we add number 12 to the set.

What can be the longest final list, if the initial set had 10 distinct numbers?