In Challenge dancing, a phrase such as

"Concept1 Concept2 Concept3 Call"

is equivalent to

Concept1 (Concept2 (Concept3 (Call)))

That is, each left-most 'concept' is applied to the entirety of everything that follows it.

For example,

Reverse 4/5 Swing The Fractions

is equivalent to

Reverse Order (4/5 (Swing The Fractions))

which is

Reverse Order (4/5 (1/4 Right, 1/2 Left, 3/4 Right, 1/2 Left, 1/4 Right))

which is

Reverse Order (1/4 Right, 1/2 Left, 3/4 Right, 1/2 Left)

which is

1/2 Left, 3/4 Right, 1/2 Left, 1/4 Right.

We also have a discussion on how to apply nested concepts on our definition for 'As Couples', located at http://www.ceder.net/def/ascouples.php

Ceder Chest Definition of Swing The Fractions