Composed by at least two sewing material, sewing two pieces of the "limited" on the same side of the edge, as shown in (a) said. The first type of additional sewing sewing material, sewing with two basic compound of any one or both ends of the edges are all the same "limited" seam material composition, as shown.

• Additional material and basic sewing the second seam sewing type (Figure)
• Additional material and basic sewing the first seam sewing type
• Additional basic sewing materials and sewing the fourth, five slit-type (Figure)
• Additional basic sewing and sewing the third category of joint type (Figure)
• Sewing basic sewing materials and additional sixth, seventh, eight categories of gap type (Figure)
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