lower ab workout help? how to get the bottom line for that six pack look?

hey what are some workouts i can do to get the bottom line seprating my abs for that 6 pack look , my fat percentage is pretty low i just need to have that bottom grove… im currently doing leg raises 2sets of 15 reps..
i dont need to loose more fat but to bulk the bottom ab area near the pelvis and the middle ab group… and to get that deep line in between

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