abstract
simple
geometric shape
brown
pink
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piping
system
systems
systematic
system-lock
system-mail
system-junk
system-file
system-time
system-deep
Fire Hydrant - piping system -...
960×576
4024
1045
Valve - industrial equipment -...
1701×615
3272
899
Gas Storage Tank - gas storage...
500×834
1031
299