Definition: 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.
Input: Sentence: 'Cases - bow and gun decoys food savers , cooking in the us cialis canada rx buy tonytigeraz viagra no physician herbal viagra alternative online ambien zolpidem xanax blue bar .', Argument/Subject 1: 'zolpidem', Argument/Subject 2: 'ambien'
Output:
be alternative to