All non-isomorphic OA(112,6,2,4)s, their GWPs and GMA ordering (.n means that the design ranks number n in the GMA ordering):

Orthogonal Array             GWP and GMA Ordering
OA(112,6,2,4).1                (0, 0, 0, 0, 0.285714, 0.020408).3
OA(112,6,2,4).2                (0, 0, 0, 0, 0.122449, 0.183673).2
OA(112,6,2,4).3                (0, 0, 0, 0, 0.122449, 0.020408).1