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proc; 
opt; opt_const -mux_undef; 
#splice; 
opt;
rename -hide;;;
#converting pmux to mux
techmap -share_map pmux2mux.v;;
memory_dff -wr_only; memory_collect;;
#flatten design
flatten;;
#converting asyn memory write to syn memory
memory_unpack; 
#cell output to be a single wire
splitnets -driver;
setundef -zero -undriven;
opt;;;