Design a simple line art icon for multifactor authentication, featuring several overlapping padlocks in black. Each padlock should be distinct yet part of a cohesive group, symbolizing multiple layers of security. The design must be clear and minimalist, allowing for easy recognition even when scaled down to very small sizes. Emphasize the concept of added security layers without clutter, ensuring it's culturally agnostic and universally understandable.
Vector imageAspect ratio: 1:1
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