Symmetric List Processor A list processing system in which each list cell contains both a forward and a backward link as well as a datum is described. This system is intended for imbeding in higher level languages capable of calling functions and subroutines coded in machine language. The presentation is in the form of FORTRAN programs depending on only a limited set of FORTRAN programs depending on only a limited set of "primitive" machine language subroutines which are also defined. Finally, a set of field, particularly character, manipulation primitives are given to round out the system. CACM September, 1963 Weizenbaum, J. CA630927 JB March 13, 1978 7:10 PM 1050 4 731 1050 4 731 1102 4 731 1549 4 731 378 4 731 2723 4 731 2882 4 731 3008 4 731 731 4 731 731 4 731 793 4 731 798 4 731 1024 5 731 1051 5 731 1098 5 731 1214 5 731 209 5 731 1380 5 731 1388 5 731 1393 5 731 1485 5 731 1487 5 731 1549 5 731 1570 5 731 1878 5 731 1946 5 731 1957 5 731 2168 5 731 2723 5 731 2857 5 731 3112 5 731 627 5 731 731 5 731 731 5 731 731 5 731 878 6 731 106 6 731 106 6 731 106 6 731 902 6 731 1051 6 731 1093 6 731 1098 6 731 1132 6 731 1177 6 731 1380 6 731 1387 6 731 1389 6 731 1393 6 731 1393 6 731 1421 6 731 1549 6 731 1626 6 731 1749 6 731 1826 6 731 1826 6 731 1826 6 731 210 6 731 210 6 731 210 6 731 210 6 731 210 6 731 210 6 731 1860 6 731 1878 6 731 296 6 731 1972 6 731 360 6 731 378 6 731 2438 6 731 2651 6 731 2723 6 731 2736 6 731 2833 6 731 2838 6 731 405 6 731 406 6 731 406 6 731 3184 6 731 627 6 731 627 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 731 6 731 753 6 731 793 6 731 794 6 731 799 6 731