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allo-aggression alternative to Chastab Kūh-e Council of Europe Cross-Sectional Ratio Analysis cylinder sieve diethylaminoethyl-dextran diplochasma alboapicata euryspecies gymnothorax buroensis Khaire limnetic fish marine wide-angle reflection seismic survey negative material transfer rickettsias segment of a sphere selection statement sheer-point traction-transmitting belt weak-link