design of parallel prefix adder in verilog

parallel_prefix_flag
....................\parallel_prefix_flag.hdp
....................\parallel_prefix_flag_lib
....................\........................\hdl
....................\........................\...\Adder.v
....................\........................\...\CSA1.v
....................\........................\...\CSA1.v.bak
....................\........................\...\CSA2.v
....................\........................\...\CSA2.v.bak
....................\........................\...\CSA3.v
....................\........................\...\CSA3.v.bak
....................\........................\...\CSA4.v
....................\........................\...\CSA4.v.bak
....................\........................\...\csa_struct.v
....................\........................\...\flagged_main_struct.v
....................\........................\...\flag_gen.v
....................\........................\...\flag_gen.v.bak
....................\........................\...\invert_flg.v
....................\........................\...\invert_flg.v.bak
....................\........................\...\main_add_struct.v
....................\........................\...\prfix_tree_struct.v
....................\........................\hds
....................\........................\...\.cache.dat
....................\........................\...\.hdlsidedata
....................\........................\...\............\_Adder.v._fpf
....................\........................\...\............\_CSA1.v._fpf
....................\........................\...\............\_CSA2.v._fpf
....................\........................\...\............\_CSA3.v._fpf
....................\........................\...\............\_CSA4.v._fpf
....................\........................\...\............\_csa_struct.v._fpf
....................\........................\...\............\_flagged_main_struct.v._fpf
....................\........................\...\............\_flag_gen.v._fpf
....................\........................\...\............\_invert_flg.v._fpf
....................\........................\...\............\_main_add_struct.v._fpf
....................\........................\...\............\_prfix_tree_struct.v._fpf
....................\........................\...\.xrf
....................\........................\...\....\csa_struct.xrf
....................\........................\...\....\flagged_main_struct.xrf
....................\........................\...\....\main_add_struct.xrf
....................\........................\...\....\prfix_tree_struct.xrf
....................\........................\...\@adder
....................\........................\...\......\interface
....................\........................\...\@c@s@a
....................\........................\...\@c@s@a1
....................\........................\...\.......\interface
....................\........................\...\@c@s@a2
....................\........................\...\.......\interface
....................\........................\...\@c@s@a3
....................\........................\...\.......\interface
....................\........................\...\@c@s@a4
....................\........................\...\.......\interface
....................\........................\...\......\interface
....................\........................\...\......\struct.bd
....................\........................\...\......\struct.bd.bak
....................\........................\...\flagged_main
....................\........................\...\............\interface
....................\........................\...\............\struct.bd
....................\........................\...\............\struct.bd.bak
....................\........................\...\flag_gen
....................\........................\...\........\interface
....................\........................\...\invert_flg
....................\........................\...\..........\interface
............

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