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I'm trying to produce a figure in black and white with geom_sf. I have seven categories so I want to make some of them patterned (rather than just shades of grey). But I can't seem to get geom_sf into black and white mode even to begin with. Any advice? Below is the code (category denotes which of the seven categories each geographic unit belongs to).

fig <- ggplot(data = d)+
  geom_sf(aes(fill = category))+
    theme_bw()
Rnewbie
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    For grayscale fill try `scale_fill_grey()`, though I'm afraid it will not help you with patterns, for those check `ggpattern::geom_sf_pattern()` , also - https://stackoverflow.com/a/67933907/646761 – margusl Jul 13 '23 at 20:56

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