How to merge color, line style and shape legends in ggplot

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Use labs() and set the same value for all aesthetics defining the appearance of geoms.

library('ggplot2')
ggplot(iris) + 
  aes(x = Sepal.Length, y = Sepal.Width, 
      color = Species, linetype = Species, shape = Species) +
  geom_line() +
  geom_point() +
  labs(color  = "Guide name", linetype = "Guide name", shape = "Guide name")

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