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+RRGtrees
+A set of LaTeX macros that makes it easy to produce linguistic tree
+diagrams suitable for Role and Reference Grammar (RRG). This package allows the
+construction of trees with crossing lines, as is required by some languages
+in this theory.
+There is no known limit on number of tree nodes or levels.
+
+Requires the pst-node and pst-tree LaTeX packages.
+
+The package also contains some macros useful for typsetting certain
+other aspects of an RRG-based language write-up.
+
+PDF files may be created via ps2pdf (ghostscript) or similar converter,
+but not via pdflatex.
+