Space travelers. Maybe every earthling
Princess Julia learned the names of all the planets of the solar system, but all the time forgot their order. The astronomer, the general, other courtiers and even the king and the queen undertook to help her and come up with suitable rules - such phrases in which all the words begin with the same letters as the planets in the right order. Very soon, Julia remembered everything, and it turned out to be not at all difficult.
This is a useful thing - mnemonics!