Thus, 11 billion pieces is an extreme lower bound on the number of preprints carried by the Postal Service.
There is 1 million more preprints unaccounted for by the Postal Service.
mnli hypothesis: There is 1 million more preprints unaccounted for by the Postal Service. premise: Thus, 11 billion pieces is an extreme lower bound on the number of preprints carried by the Postal Service.