The Princes Name the Sisters' Order

From A6.4, Fereydoon’s Sons Go to Yemen. It illustrates A6.4.11–19:

A6.4.11
At dawn King Sarv’s three daughters duly came,Just as Fereydoon had foretold his aim.
A6.4.12
Like shining moons, they entered, fair and bright,So bright their faces dazzled mortal sight.
A6.4.13
They sat exactly as the Shah had said,In that same order Sarv had planned instead.
A6.4.14
Then Sarv addressed the three and asked them plain:“Which of these stars is youngest? Now explain.
A6.4.15
Which one is middle, which the eldest maid?Now tell me how their order is arrayed.”
A6.4.16
They answered as their father’s lessons taught,And broke the snare that cunning Sarv had wrought.
A6.4.17
King Sarv stood with his warriors amazed,By wisdom all three princes had displayed.
A6.4.18
King Sarv perceived his mixing plan had failed;Confusing colors nothing now availed.
A6.4.19
He said, “The proper order now is clear:Give young to young, the elder to her peer.”