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concave function
concave function
concave function
concave grating
concave grating
concave-grating spectrograph
concave holographic grating
concave lens
concave lens
concave milling cutter
concave mirror
concave mirror
concave mirror
concave mirror
concave operator
concave polygon
concave polygon
concave polyhedron
concave programming
concave relief
concave scraper
concave slope
concave slope
concave upward
concave up(ward)
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