FIG. 8A is a flow chart of the a preferred embodiment of the generalized-branch-and-bound version of the present invention for Pure Linear Integer Programming Computing System, which is continued on FIGS. 8B, 8C and 8D. FIG. 8B is a flow chart of the a preferred embodiment of the generalized-branch-and-bound version of the present invention for Pure Linear Integer Programming Computing System, whi