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: 'Deutsche Lufthansa AG , Europe 's second-biggest airline , is facing disruptions tomorrow after the pilots ' union called on workers to stage strikes over pay .', Argument/Subject 1: 'lufthansa', Argument/Subject 2: 'europe'
Output:
be airline in