More: e and f must result only from sums (or differences) of products between on the one hand (a, b) and on the other (c, d).

[5600,19200] doesn't fit the bill if a=b=c=d=100.

I was encountered the same issue. It will not accept my answer because our order is different :|

[[903, 449], [4503, 2251]] should equal [[4503, 2251], [903, 449]]

I recevie the following error when I tried to submit the answer.
[[0, 20000], [5600, 19200]] should equal [[0, 20000]]

Based on my understand for this question, both answers I submitted should be correct.
Can someone enlgiht me?
Thank you,