For the rest, the only thing to eat—though it didn’t look eatable in the least—I saw in their possession was a few lumps of some stuff like half-cooked dough, of a dirty lavender color, they kept wrapped in leaves, and now and then swallowed a piece of, but so small that it seemed done more for the looks of the thing than for any serious purpose of sustenance.
There are no more uses of "sustenance" in the book.
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The soup kitchen was her only sustenance.
As they grew more affluent, gardeners planted more for beauty than for sustenance.