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audio visual aids blowing-current bulwark gripper chained segment clamp upset decatopecten amiculum Internaltional Committe on Mental Hygiene krashen premonocyte quasi-analog signal rayon direct spinning machine run-time stack top sample switching shaking grate rod standard hair weight strain meter thermally induced refractive index gradient tipula (indotipula) demoarcata urophosphometer wolffian ridges