1) make_excerpt() : takes starting and ending (optional) measures and then creates an excerpt after retrieving corresponding globalkey and localkey information
2) extract_phrases() : calls make_excerpt() method for each pair of starting and ending measure corresponding to a phrase
3) extract_random_snippets() : takes as parameters number of snippets and snippet length to randomly create excerpts (calls the make_excerpt() method for each randomly generated pair)
1) make_excerpt() : takes starting and ending (optional) measures and then creates an excerpt after retrieving corresponding globalkey and localkey information 2) extract_phrases() : calls make_excerpt() method for each pair of starting and ending measure corresponding to a phrase 3) extract_random_snippets() : takes as parameters number of snippets and snippet length to randomly create excerpts (calls the make_excerpt() method for each randomly generated pair)