We have explained in our article Biblical Formatting located on the world wide web at http://www.Rashiyomi.com/biblicalformatting.pdf, that the Biblical Author indicated bullets by using repeating keywords.

That is, if a modern author wanted to get a point across using bullets - a list of similar but contrastive items - then the Biblical Author would use repeating keywords. Today's verse illustrates this principle.

Bullets whether indicated through modern notation or through the Biblical method of repeating keywords always indicate contrastive emphasis - that is, each bullet is presumed to be a distinct item contrasted to the other items on the list. Very often the bullets are also used to indicate that the entire list is exhaustive of some spectrum.

Verse(s) Ex28-06b discussing the threads used in the Eyfod cross references Ex39-03 which states And they did beat the gold into thin plates, and cut it into wires, to work it
• in the midst of the sky-blue, and
• in the midst of the purple, and
• in the midst of the scarlet, and
• in the midst of the six-ply [linen], with skilful work.
The repeated underlined phrase in the midst creates a bullet effect. The bullet effect in turn creates an emphasis on the distinctness of all enumerated items. Rashi interprets the distinctness as follows Gold threads were combined with each of the other 4 threads. So the linen thread was six-ply linen as explicitly indicated. The gold thread combined making a 7-ply thread. Similarly the sky-blue thread was 6 ply and became 7 ply with the combination of the gold thread. (Without the bullets I would read the verse as requiring combining one gold thread with the the 4 6-ply threads making a 25-ply thread; however, the bullets require combining four 7-ply threads creating a 28-ply thread).