sentences:  This focus could be defined as a poetry and poetics that grew out of a counter-poetic tradition that took root in 20th-century North America.Today, some of the more recognizable of these avante garde and experimental groups would include Black Mountain poets, the New York School, Language poets, and the San Francisco Renaissance.Broadly defined, the various groups and "schools" found antecedents in the diverse theories and practice of John Cage and Gertrude Stein, George Oppen and William Carlos Williams, Charles Olson and Robert Duncan, or Madeline Gins and Shusaku Arakawa.