Write a function to create a fish structure with 10 elements randomly. Breed of all fish should be trout, length should be assigned a random integer between 0 and 100, weight should be assigned a random number between 0 and 1. After all 10 fishes are created, check the length of each fish. If the length is not in 20 - 40 cm range, delete the element from structure. Function should return the created fish structure with at most 10 elements.

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