In the context of Harappan urban sanitary engineering, the structural deployment of 'corbelled brick arches' (pointed masonry vaults) was specifically implemented to construct which of the following?

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Harappan civil planners deployed advanced load-bearing mechanics. When building wide main public drains that ran directly beneath major streets, they abandoned flat brick covers. Instead, they placed bricks at a staggered angle to form a corbelled arch, distributing the heavy overhead traffic and street weight evenly without collapsing.

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