Question about Linked Cosmetic Set Pricing

My understanding is that buying a set of cosmetics is cheaper than buying each unique part of that cosmetic, which is why they're listed as 10% off when buying the full set.

But the linked cosmetics are also listed as 10% off despite not being able to buy any portion separately.

Should the linked cosmetics not just be stated as regular price without a percentage discount, or have I misunderstood?

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