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...her dominating car exists. There, a car dominates another car if its horsepower or miles-per-gallon value is strictly better while the other value is better or equal. See http://p-roocks.de/rpref/index.php?section=examples for more examples. The changes of this version include: - A new function get_btg_dot to generate Better-Than-Graphs induced by the preference using Graphviz. - Fixed compatibility issues with new versions of dplyr and testthat. Comments and contributions are very welcome via github: https://github.com/patrickroocks/rpref Best regards, Patrick