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gamma function
graphics animate,   current_window,   eps,   epsi,   fma,   hcp,   hcp_file,   hcps,   keybd_focus,   palette,   pdf,   plq,   plsys,   pnm_colorize,   redraw,   rgb_read,   set3_object,   window,   winkill  
grid GaAxisStyle,   gridxy,   to_corners3