recycle(c(1,2,3), 7)
recycle(c(1,2,3), letters[1:7])
recycle(c(1,2,3), 7, na.fill=TRUE)
recycle(1, letters[1:3], na.fill=TRUE)
recycle(letters[1:3], 7)
recycle(letters[1:3], letters[1:7])
recycle(letters[1:40], letters[1:7]) # vec is cut off
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