Nothing
library(grid)
require(gridSVG)
grid.polyline(x=outer(c(0, .5, 1, .5), 5:1/5),
y=outer(c(.5, 1, .5, 0), 5:1/5),
id.lengths=rep(4, 5),
gp=gpar(col=1:5, lwd=3))
grid.export("polyline.svg")
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