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urbit.org/docs/programming/reference/runes/wt/wtts.md
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1# `:ifits`, `?=`, "wuttis" `{$fits p/twig q/wing}
2====
4Is `q` within type `p`.
6Tests whether `q` is of mold `p`.
8Regular form: *2-fixed*
10Examples:
12 ~zod/try=> ?=(@ 'a')
13 %.y
14 ~zod/try=> ?=(^ 'a')
15 %.n
16 ~zod/try=> ?=(%b 'a')
17 %.n
18 ~zod/try=> ?=(%a 'a')
19 %.y