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: 'Emerald is the birthstone for May and is known for being the 20th and 35th wedding anniversary gemstone .', Argument/Subject 1: 'emerald', Argument/Subject 2: 'may'
be birthstone of

Sentence: 'I was born and raised in Slovakia when it was still a part of Czechoslovakia .', Argument/Subject 1: 'slovakium', Argument/Subject 2: 'czechoslovakium'
be part of

Sentence: 'Bianca Bezdek is a member of the New York , European Union and Czech Republic bar associations , and is a former associate at top global law firms Linklaters and Weil , Gotshal and Manges in Prague , Berlin and London .', Argument/Subject 1: 'czech republic', Argument/Subject 2: 'european union'
be member of