There is no checking to prevent multiple arcs between any pair of nodes. The program can either read the input parameters from the standard input or from a batch file. In this mode multiple sets of data can be generated at a time. Simply stack the sets of data into the same file. Comments can be added after each data.
Batch files have the format as shown below.
Each input data must occupy a line and the data itself should be at the very beginning of each line. If a batch file name is in the command line, and the batch file have not been opened yet, open it. This function is a slight modification of a piece of code provided by Joseph Cheriyan. We would like to thank him for their help.