Identifiable repeated or corresponding elements in a text. These include patterns of repetition or similarity, such as the repetition of imperative verb forms at the beginning of each step in a recipe, or the repetition of a chorus after each verse in a song. Patterns may alternate, as in the call and response pattern of some games, or the to-and-fro of a dialogue. Patterns may also contrast, as in opposing viewpoints in a discussion or contrasting patterns of imagery in a poem.