subtraction of terms of the same sign

air-blower room cyclical theory of regeneration deglucocheirotoxin flight load forces down heterokurtic high speed scrubber high-expansion foam fire extinguishing system in m intail l-aspartic acid laterialis (laterialis) oculatus lemmatizes lightyears macroporphyritic magnetic potential drop myristyl-trimethylsilicane rugged topography sbsasbsys-s slackening of speed synthetic lethals(dobzhansky 1946)