Crabs have three kinds of internal organs that can't be eaten: gills, lungs, stomach and intestines. They must be cleaned when eating. Gills and lungs are located on both sides of the crab, which are distributed symmetrically in a wisp shape; The stomach is near the mouth of the crab, covered by crab yolk; Intestines are located on crab roe, which is a thin pentagonal piece. ? The position is shown in the circle below:

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