How is tadhyīl distinct from word-for-word repetition?

Iṭnāb: Tadhyīl, Takmīl (Iḥtirās), and Tatmīm

• The appended clause can confirm the earlier meaning in different wording
• Tadhyīl must negate the earlier assertion
• Tadhyīl never involves emphasis
• Repetition occurs only in poetry