Note the contradiction in the following verses.
• Verse Ex28-37 discussing the Priestly mask, where it was worn, and its relationship to the Priestly mitre / turban states And thou shalt put it [the mask] on a thread of blue,
• and it shall be upon the mitre;
• opposite the forefront of the mitre it shall be.

We see the contradiction: Which is it: Was the mask on the turban or opposite the turban?

Rashi resolves this contradiction using the 2 aspects method of contradiction resolution. The Priestlyl mask was secured with two/three threads
• One set of threads went around the head just as masks today are worn. The mask itself was on the forehead opposite the turban and the threads went around the head to secure it
• But there was another thread that went over the head and turban

The following diagram clarifies

			
                           (A)
                   (A)/----------------|
                     /         | (B)   |(A)
		mask/   Priest    Head |
                    \          |       |
           eyes      \                 |
                   (A)\        | (B)   |(A)
                       \---------------|
                            (A)



The Priest Mask was above the eyes
Thread A went around the Priest Head and tied in back
Thread B went over the Priest's Head and tied to thread A
--------------------------------------------------------
Consequently, the Mask was secured with two threads A & B
Thread A was opposite and beneath the turban around the head temples.
Thread B went over the head; it was above and on the turban

Hence we see that there are two aspects to the Priestly Mask/Turban relationship. There is a mask on the Turban and there is a mask around the Turban.

Advanced Rashi: The above Rashi requires two techniques: The Contradiction technique and the spreadsheet technique. We will therefore repeat this example below in rule #9.