One thing to note is that you need to specify the center block and the prongs ~

Rhombus is the center block, trapezoid is the prongs ~

Doing the formula, pay attention to: don't turn the direction of the mess, the dumplings are not as well grasped as a sense of location of the third-order

Lastly, you need two formulas:

Another one is top center block turn 180 degrees formula: U R L U2 R' L' continuously do 2 times

One is the top center block counterclockwise turn 90, the left center block clockwise turn 90 degrees: (D U' F B' R L') U' (L R' B F'U D') L

Still do not understand, you can go to Baidu search, but it seems that there is not too full ~

These two formulas are not the most important.