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: 'Our vacation options include : Escorted Tours , Locally Hosted Tours , Custom Vacations , Resort and City Stays , River Cruises of Europe and Russia , Self Drive Vacations , Safaris , Cruise-Tours , Group Travel and Special Interest Tours .', Argument/Subject 1: 'russium', Argument/Subject 2: 'europe'
be include with