What's the "een" in Halloween?
1. Early PL/I.
2. Experimental Programming Language.
3. Eden Programming Language.
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.