With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: The Edge occasionally acts as lead vocalist in some of U2 's performances .
text_B: 21 , 23–24 is an Irish musician and songwriter best known as the lead guitarist , keyboardist , backing and occasional lead vocalist of the rock band U2 .
SUPPORTS.