With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: Istanbul is a world center .
text_B: Istanbul -LRB- -LSB- ˌɪstænˈbʊl -RSB- , -LSB- - ˈbuːl -RSB- or -LSB- - stɑːn - -RSB- İstanbul -LSB- isˈtɑnbuɫ -RSB- -RRB- , historically known as Constantinople and Byzantium , is the most populous city in Turkey and the country 's economic , cultural , and historic center .
REFUTES.