To say that A-some-B is to say that some As are Bs.
To say that B-some-A is to say that some Bs are As.
That said, we are allowed to reverse some statements. Let's Take the example of "some shirts are blue" which we can diagram as shirts-some-blue. This means that at least one shirt is blue. Since we know that at least one blue shirt exists, we can say that some blue objects are shirts. Therefore, Blue things-some-shirts.
Some statements are reversible, so in practice there is little difference between v-some-u and u-some-v.