|Here the four patches are laid out in the block configuration (the arrow is pointing to the thread that still attaches the two pairs) (yes - the others are attached as well - I just drew ONE arrow)|
|Take your seam ripper and RELEASE the stitches. DO NOT cut that thread - just release it on BOTH sides of the seam|
|Then split that seam in the center and notice how the four seams will go in a clockwise or counter clockwise direction (the direction depends on whether you flipped the left most pair up or down).|
|The back side of the previous picture - note that the seams of ALL four of the four patches are going in a clockwise direction and so when the four patches get sewn together - the seams will nest into each other at ALL four intersections|
|Then sew the four patches together to get two HALVES - and note that you can continue to twirl the seams on those two seams. Notice in the center - those seams will NEXT perfectly to each other.|
|Lastly sew the two halves together and YES - you can twirl all three of those intersections|
You can ONLY twirl the seams if you sew in FOURS and TWIRL as you go. If you sew in rows or want to twirl once you have finished the block - it WILL NOT work.
Hope that clears up that mystery. Let me know if there are any questions.