I've been fussing about endlessly attempting to draw simple box diagrams. What I need is circular nodes connected with plain lines - no arrows. Every single option I tried failed somehow.
I tried using xymatrix, but whenever I asked for plain arrows, the command would not execute. I tried the diagrams package, but couldn't understand how to draw plain lines instead of arrows. Finally, I tried pgf/TikZ and pstricks, but whenever I try to import them to my code, the following error occurs (within the xcolor package).
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