String manipulation and pattern matching language by Klint & Sint at ef="module.php?name=Lexikon&file=search&eid=1&query=CWI">CWI in the late 1970s. It was recently used as the input and implementation language for the {Dataflow Compiler Project} at {CWI}. ["An Overview of the SUMMeR Programming Language", Paul Klint, 7th POPL, ACM 1980, pp. 47-55].