How do I build an indexer that constructs an inverted index of n-gram, which are discrete, continuous unit of two or more characters in java? 1. I will use the Jargon File for a source text 2. I will need to handle spaces and line breaks 3. I need to look through to note how some :words: are 4. I need to produce an index that lists a. The token b. Its relative frequency c. Its absolute frequency (the count of its appearances) 5. The program should be runnable from a command line, with the ability to pass in relevant inputs (e.g., input file, output file, n-gram length) on the command line or via text entry (e.g., using Scanner in Java)