Why did andy warhol print the above images of marilyn monroe in this order?

Marilyn Monroe was the first of the print-publishing of Andy Warhol, which is created in 1967.  He used the same style with 10 different color variations. Each image was printed from five different screens: one had a photographic image and four others with different areas of color. Indeed, the pictures were repetitive. About repetitions, Warhol said: “The more you look at the same exact thing, the more the meaning goes away, and the better and emptier you feel." 
In this below-attached picture, you can see the complete series.