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Mathematics in Grade Two, Book Two, Hunan Education
Translate the waist to the midpoint e of the upper sole to get the triangle EMN.

Then EF is the center line of the triangle, em = 8, en = 6,

Double-length midline can prove that the value range of double midline length is between the sum and difference of adjacent sides.

So 2 < 2EM< 14, the solution is 1