There are two examples that are used in this document to illustrate the two different types of synonym relationships. The first example uses the terms "iPod", "mp3", and "mp3 player" and illustrates the one-way relationship, where the terms are not all synonyms for each other. The second example uses the terms "tv", "television", and "telly" and illustrates the two-way relationship, where the terms are all synonyms for each other.