formal: verify
formal: We would
formal: a great deal of, numerous
formal: therefore
formal: decrease
formal: purchase
formal: however, on the other hand
formal: It is said that...
formal: concerning, regarding
formal: respond
formal: initially
formal: superior
formal: increase
formal: satisfactory, acceptable
formal: due to, as a result of
informal: lots of, a lot of
informal: They say that
informal: We´d
informal: at first
informal: about
informal: that´s why
informal: buy
informal: OK
informal: better
informal: check
informal: but
informal: because
informal: go down
informal: go up
informal: answer