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The 2015 International Building Code (IBC) in chapter 1807.2.1 states that when a keyway is extended below the wall base to engage passive pressure and enhance sliding stability, the lateral soil pressures on both sides of the keyway must be considered in the sliding analysis. However, this statement is missing in the 2018 IBC. My question is, do we still need to consider the lateral soil pressure on both sides of the shear key in the sliding analysis of the retaining wall when using the 2018 IBC?"