sponsored by the Association for Computing Machinery, Special Interest Group on Automata and Computability Theory [and] Special Interest Group on Programming Languages. sponsored by the Association for Computing Machinery, Special Interest Group on Automata and Computability Theory, Special Interest Group on Programming Languages. sponsored by the Association for Computing Machinery, Special Interest Group on Automata and Computability Theory (SIGACT), Special Interest Group on Programming Languages (SIGPLAN) sponsored by the ACM, Special Interest Group on Automata and Computability Theory, Special Interest Group on Programming languages. sponsored by the Association for Computing Machinery, Special Interest Group for Automata and Computability Theory, and supported by Smith College. sponsored by the Association for Computing Machinery, Special Interst Group on Automata and Computability Theory and supported by The University of Colorado. sponsored by the Association for Computing Machinery, Special Interest Group on Minicomputers ; edited by G. W. Gorsline. sponsored by the Association for Computing Machinery, Special Interest Group on Programming Languages. sponsored by the Association for Computing Machinery Special Interest Group on Programming Language. sponsored by the ACM Special Interest Group for Automata and Computing Theory [and] the ACM Special Interest Group for Operating Systems.