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.
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Question: Sentence: 'October birthstone , Pink Tourmaline set in 14K yellow frame with 14K rose , 14K white and 18K yellow gold .', Argument/Subject 1: 'tourmaline', Argument/Subject 2: 'october'

Answer: be birthstone of


Question: Sentence: 'Born in Copenhagen , Denmark , Hansen is relatively new to the world poker scene but has already amassed winnings in excess of $ 1.8 million and has three WPT championship wins to his name .', Argument/Subject 1: 'hansen', Argument/Subject 2: 'copenhagen'

Answer: be bear in


Question: Sentence: 'Buried underneath the troubled Darfur province in northwestern Sudan is an ancient mega-lake , satellite data shows .', Argument/Subject 1: 'darfur', Argument/Subject 2: 'sudan'

Answer:
be province of