# NOT RUN {
dir.create("UnitDirs_test")
setwd("UnitDirs_test")
files <- c("1litres_1.txt", "1litres_3.txt", "3litres.txt", "5litres_1.txt")
file.create(files)
unitize_dirs("litres", "\\.txt")
setwd("..")
dir.remove("UnitDirs_test")
# }
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