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Hi there
How big is your spider?
In order to be able to give you our help you need to soak the moult in water and a small drop of dish washing detergent.Once soft you need to VERY gently unfold the abdomen and take clear picture of it with both pairs of book lungs visible.
Easier done with larger spiders but if you are careful small ones are doable but moults are very fragile.
Example below.