Functions that work on text

Can you set the sep argument to FALSE?

No. When you look at the documentation of the paste() function you see that sep has to be a character string (= text).

It’s not a Boolean. So it has to be text (or nothing) in between double quotes. So you can set sep = “FALSE” but then he’s going to use the word FALSE as a separator between the two pieces of text that you are pasting.