(x <- split_token(DATA[["state"]][1], FALSE))
combine(x)
(x2 <- split_token(DATA[["state"]], FALSE))
combine(x2)
(x3 <- split_sentence(DATA))
## without dropping the non-group variable column
combine(x3)
## Dropping the non-group variable column
combine(x3[, 1:5, with=FALSE])
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