# NOT RUN {
p = matrix(1:4, ncol = 2)
library(sp)
l = points2line(p)
plot(l)
l = points2line(cents)
plot(l)
p = line2points(routes_fast)
l = points2line(p)
plot(l)
l_sf = points2line(cents_sf)
plot(l_sf)
# }
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