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+read_verilog rom.v
+proc
+flatten
+equiv_opt -assert -map +/ice40/cells_sim.v synth_ice40 # equivalency check
+design -load postopt # load the post-opt design (otherwise equiv_opt loads the pre-opt design)
+cd top # Constrain all select calls below inside the top module
+select -assert-count 5 t:SB_LUT4
+select -assert-none t:SB_LUT4 %% t:* %D