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.