With no explanation, label text_A→text_B with either "NOT ENOUGH INFO", "REFUTES" or "SUPPORTS".
text_A: Key buttons are uncommon in modern designs for keys other than the stack keys .
text_B: Key buttons are advantageous for operating keys with direct downward finger pressure but provide disadvantages operating keys with other finger and hand motions , hence , they are not part of modern designs for keys other than the stack keys .
SUPPORTS.