Given two noun phrases (arguments) and relationship between them, form a sentence that expresses theses arguments with the given relationship.

Q: Relationship: 'be celebrate in', Argument/Subject 1: 'black history month', Argument/Subject 2: 'february'

A: February is Black History Month , celebrating African American Heritage .
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Q: Relationship: 'be member of', Argument/Subject 1: 'executive director', Argument/Subject 2: 'board'

A: Suresh is an ex officio member of the Board of CFI London , being Executive Director and Company Secretary of CFI London .
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Q: Relationship: 'be acronym for', Argument/Subject 1: 'pstn', Argument/Subject 2: 'public switch telephone network'

A:
PSTN is an acronym for Public Switched Telephone Network , which refers to the international telephone system .
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