R provides a collection of predefined named
colours as returned by grDevices::colours():
colours() %>% sample(12)
##  "royalblue4" "navajowhite" "snow1" "grey1"
##  "gray93" "turquoise3" "lightseagreen" "grey24"
##  "snow2" "grey94" "lemonchiffon" "grey29"
Colours can be selected using epitools::colors.plot() with
TRUE to display a plot containing all of the
named colours. Multiple clicks with the left mouse button on colours
(we hear a beep for each click) will return the colour names.
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