Q: Given a sentence and two mentions from the text (arguments), indicate a phrase (a verb or noun phrase) that describes the relationship between the provided arguments.
Sentence: 'June 15 , 2007 , 7:30 pm . about approved Nexium No Prescription at the ... nexium buy nexium buy nexium online nexium online generic nexium purchase nexium nexium no prescription cheap nexium cheapest nexium order nexium nexium pills nexium ... Buy Nexium online from our US based online pharmacy without prescription .', Argument/Subject 1: 'purchase', Argument/Subject 2: 'online'
A:
buy