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This spawned a whole area of new research based on teaching sign language, specifically Ameslan, the American version of signing.

A chimp with a degree in Yerkish or Ameslan exhibits the ability to form concepts from his store of word symbols.

Signed English, or manual translation of the language, is used in classes as the teachers speak their lectures, while Ameslan, or American Sign Language, a grammatically different and faster sign language, is used by some teachers and is popular among the students out of class.