?i?u này ??c bi?t quan tr?ng trong các ?ng d?ng ?òi h?i t?c ?? ??ng c? thay ??i liên t?c, nh? trong các ?ng d?ng tàu thuy?n hay trong các h? th?ng ?i?u khi?n t? ??ng.The crucial element is to be certain the seams on the ribbon never tumble about the corners of the quilt. When they do you'll want to realign the ribbon to get These seams into