I Spy Book: Where's the "s" on Page 18?

I've found two letter "b"'s on beads, so I was expecting the "s" to be on a bead, too, but no luck so far. Anyone find it?
Update: In the I Spy Book of Fantasy, it says there's supposed to a letter "s" somewhere. I've found two letter "b"'s on beads, so I thought that the "s" might be on a bead, too, but no luck so far. Anyone find it?
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