1. Early PL/I.2. Experimental Programming Language.3. Eden Programming Language.U Washington.Based on Concurrent Euclid and used with the Eden distributed OS. Influenced Emerald and Distributed Smalltalk."EPL Programmer' s Guide", A. Black et al, U Washington June 1984.4. Equational Programming Language. Szymanski, RPI. Equational language for parallel scientific applications. "EPL - Parallel Programming with Recurrent Equations", B. Szymanski in Parallel Functional Languages and Compilers, B. Szymanski et al, A-W 1991.