Which of these is not a definition of the main idea?

The small pieces that make the big picture.
Essential thoughts are often observed: at the start of paragraphs. the first sentence frequently explains the issue being discussed in the passage. Within the concluding sentences of a paragraph.
The primary idea is the significant, or most vital, a concept in a paragraph or passage. It states the motive and sets the route of the paragraph or passage. the main idea can be stated or it can be implied.
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