Type 2: Nouns or pronouns in need of clarification

3.

[1] The Large Hadron Collider, the most powerful particle collider in the world, was built to test theories of particle physics. [2] In particular, it was used to prove the existence of the Higgs Boson, a new type of particle that helps explain why things have mass. [3] The Collider is based at the CERN Laboratory and contains four types of detectors. [4] Having more than one detector carry out the same tests gives scientists the ability to cross-check results and identify any anomalies in the data they generate.

Type 4: Lead/topic sentences

7.

[1] Clinical studies have shown that squatting is better than any other lower-body movement for muscle hypertrophy. [2] In fact, the rate of muscle growth can be up to three times as fast if squats are done correctly as part of a regular workout routine. [3] The back-squat is considered the king of all bodybuilding movements. [4] Most injuries in the gym, however, stem from accidents caused by poor form. [5] As a result, runners will rarely use squats as part of their training.