Question

Can the leaves of an ordered rooted tree have the universal address 1.1, 1.2.1, 1.2.2, 1.2.3, 2.1, 2.2.1, 2.3.1, 2.3.2, 2.4.2.1, 2.4.2.2, 3.1, 3.2.1, 3.2.2? if so, identify such an ordered rooted tree.

Answer 1

The following picture illustrates what the rooted tree would look like. By following the branches, you will reach all of the addresses indicated in the question

Answer 2

A pine is just such a tree.