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concave polyhedron
concave programming
concave programmingproblem
concave protecting disk
concave reflection grating
concave reflector
concave region
concave ridging body
concave rim
concave rim wheel
concave roll
concave rolling disk colter
concave saw
concave-setting lever
concave-shaped compact
concave shear
concave slide
concave slope
concave solid cutter
concave spherical mirror
concave sucking disc
concave surface
concave tile
concave veins
concave weld
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