Method 2: Use "105 fixed epic and 105 random epic" b as the feed to upgrade the A equipment required by the corresponding parts.
12 parts can be upgraded in three ways:
Situation 1A and B devices are two devices with exactly the same position. If you upgrade A with B, all four items are "full experience" upgrades.
In the case of 2A and b, these four items are different. When upgrading A with B, you can only get "10%B equipment experience" from four items.
In cases 3A and b, some of the four items are the same while others are different. Upgrade A with B, with the same term "full experience upgrade" and different term "10% experience upgrade".