let's assume current feed price is 0.02USD/BTS

the ask order:

a1. 0.019

a2. 0.02

....

the short order:

b1. interest 10%, limit 0.025

b2. interest 30%, limit 0.019

the bid order:

c1. 0.0195

c2. 0.018

which two orders will execute first?

from the source code, looks like a1 match b2 first, am I wrong?