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acoustical model annulment of law betaine type amphoteric surfac-tants combining standard deviations dipole shear sonic imager dog('s)-tooth check Fossa antihelicis illuminated blade inward-opening window laughing academy melt section methixart microcomputer family moon-landings Oktong-ri ST_space_next-to-and-beside staffat subjective trial of lens weather moor X-ray crack detection