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You can choose from Bearing Wall or Building Frame as the system used to set the default Response Modification Factor R and Seismic Amplification Factor Cd from ASCE 7 Table 12.2-1, and to determine the overstrength Ω0 factor used for diaphragm design transfer forces from discontinuous shear lines on the level above (12.10.1.1), which are used for drag strut forces as per 12.10.2.1.