if(require("grid")) {
library(grid)
grid.newpage()
grid.polygon(x=(x_star + 1)/2,
y=(y_star + 1)/2)
grid.newpage()
grid.polygon(x=(x_cross + 1)/2,
y=(y_cross + 1)/2)
grid.newpage()
grid.polygon(x=(x_hexagon + 1)/2,
y=(y_hexagon + 1)/2)
grid.newpage()
grid.polygon(x=(x_airplane + 1)/2,
y=(y_airplane + 1)/2)
grid.newpage()
grid.polygon(x=(x_maple + 1)/2,
y=(y_maple + 1)/2)
}
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