Are two 'teams' stronger than one? This 'rotation' of judges means that Christina Aguilera and Cee Lo Green will return alongside Adam Levine and Blake Shelton for season 5 in the fall -- while Usher and Shakira will take season 6 in the spring of 2014.
A rule or rule set is a statement that tells browsers how to render particular elements on an HTML page. A rule set consists of a selector followed by a declaration block. The selector selects the elements on an HTML page that are affected by the rule set.
The empty set is a subset of every set. Let's define subset. A set is a subset of another set if every element of the set is also an element of the other set. Set A is a subset of Set B if every element of A is also an element of B.