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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 imbedding 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 “primitive” machine language subroutines which are also defined. Finally, a set of field, particularly character, manipulation primitives are given to round out the system.
Joseph Weizenbaum (1963) studied this question.