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main_dt <- as.data.table(main) %>%——————————
.[, `:=`(from = key, to = key, key = NULL)]
dict_dt <- as.data.table(dict, key = c("from", "to"))
foverlaps(main_dt, dict_dt)
grouping_var from to id i.from i.to
1: a 1 4 1 1 1
2: a 1 4 2 4 4
3: b 5 9 3 6 6
4: <NA> NA NA 4 15 15
AS