an out and out reactionary political force

an out-and-out country life

breed out and out

casting-out-9 check=casting out nines

from out to out

out and out

Out of sight and out of mind

out-and-out

out-to-out

rain（-）out wash（-）out

two way serial in parallel out and parallel in serial out transceiver

2-opt

2-opt Algorithm

2-opt method

2-OPT sub-routes optimization

2-OPT(superscript *)

3-opt neighborhood structure

co-opt

D-opt