> g++ -o llil3vec -std=c++20 -Wall -O3 llil3vec.cpp
> time ./llil3vec big1.txt big2.txt big3.txt  >f.tmp
llil3vec (fixed string length=6) start
get_properties      CPU time : 1.47895 secs
emplace set sort    CPU time : 0.592783 secs
write stdout        CPU time : 0.832071 secs
total               CPU time : 2.90392 secs
total        wall clock time : 3 secs

real    0m3.217s
user    0m2.806s
sys     0m0.412s

> diff f.tmp vec.tmp

> g++ -o llil3vec -std=c++20 -fopenmp -Wall -O3 llil3vec.cpp

> time ./llil3vec big1.txt big2.txt big3.txt  >f.tmp
llil3vec (fixed string length=6) start
get_properties      CPU time : 2.5809 secs
emplace set sort    CPU time : 0.793355 secs
write stdout        CPU time : 0.860855 secs
total               CPU time : 4.23521 secs
total        wall clock time : 3 secs

real    0m2.673s
user    0m4.073s
sys     0m0.465s

> diff f.tmp vec.tmp