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arteries have thinner walls than veins
arteries have thicker walls than veins
do arteries have thicker walls than veins
are veins thinner than arteries
why arteries have thicker walls than veins
why are veins thinner than arteries
which have thicker walls veins or arteries
do veins or arteries have thicker walls
do arteries have thin walls
which has thicker walls arteries or veins
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