Abstract
The following quote was obtained by the news editors from the background informa tion supplied by the inventors: “People frequently sign up for trials of activit ies with entities. These trials, which are often free or reduced-price, are a ma jor tool for both users and entities. For users, the trials represent an opportu nity to try a new activity or service for free or reduced cost before signing up for the activity on a long-term basis. For entities, trials are a crucial chanc e to get a user attached to an activity, which makes the user more likely to con tinue with the activity after the trial ends.
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