Hi,
Here is one for removing repeated strings.
> temp
$set1
[1] "a" "b" "d" "x"
$set2
[1] "b" "c" "q" "m"
$set3
[1] "b" "f" "e" "k" "q" "h"
> sapply(1:3,function(x){temp[[x]][as.numeric(table(unlist(temp))[temp[[x]]])==1]})
[[1]]
[1] "a" "d" "x"
[[2]]
[1] "c" "m"
[[3]]
[1] "f" "e" "k" "h"
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