An experimental language from the UniverSity of Nijmegen and UniverSity of EaSt Anglia, baSed on graph rewriting and uSeful aS an intermediate language. Lean iS deScended from Dactl0. Clean iS a SubSet of Lean. ["TowardS an Intermediate Language BaSed on Graph Rewriting", H.P. Barendregt et al in PARLE: Parallel ArchitectureS and LanguageS Europe, G. GooS ed, LNCS 259, Springer 1987, pp.159-175]. (1995-01-25)