The book begins with lengthy introductions and character descriptions. Extras include introductions by Steve Smith, and Red & Harold character biographies. Additions to available species pools through range expansions and introductions can also continually reshape communities. There were several variations of program introductions. They grouped the topics into 102 chapters, for which Adler wrote 102 introductions. Another characteristic is the use of busy violin passages for the musical introductions and interludes. He recorded introductions and narratives for the titles. Editors customarily published fanciful, often nostalgic introductions to the material that included unsubstantiated statements. Proposals for further such introductions remain controversial. The former contained racer introductions and production insight into the casting process. Common events include ranked challenges against other players, floor clearing, character introductions and seasonal events. Mueller also requested Barr release the Mueller Report's introductions and executive summaries. Introductions and codas also extended the form. The two make introductions, and Joy mentions her dream. This is usually preferred for introductions to the topic.