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elements of xy4 programming



Perhaps, I am asking to much, but as Xy4 differs  or is more sophisticated than Xy3,  I wonder if its is possible for an exposition be written the same way Herb Tyson did when he gave an example of  the basic elements from a program he wrote. For instance, I would like to know the Xpl structure of say Robert,s Callnext U2 program, but of course it can be any other.