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urbit.org/docs/programming/reference/runes/br/brwt.md
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1---
2sort: 5
3---
5# `:tray`, `|?`, "barwut", `{$tray p/twig}`
7`|-` with hidden context.
9Produces: a lead trap with expression `p` whose context is hidden to avoid type conflicts.
11Examples:
13 > |?(20)
14 < 1?aoy
15 { {a/^#3.?({i/@ud t/#3} ^#2.?({i/@ud t/#2} it(@ud))) our/@p now/@da eny/@uvI}
16 $~
17 <282.ucw 42.juj 402.arm 110.jyx 1.ztu $151>
18 }
19 > ~zod/try=> +:|?(20)
20 > +:|.(20)
21 [ [ a=[i=1 t=[i=2 t=[i=3 t=~]]]
22 our=~sivtyv-barnel
23 now=~2016.3.29..04.14.18..9a26
24 eny=0v16.dkepv.qm6er.7v2mh.kcdva.oisv9.th4dl.era7v.pj315.fd6la.76d34
25 ]
26 ~
27 <282.ucw 42.juj 402.arm 110.jyx 1.ztu $151>
28 ]
30As demonstrated above, a lead core's payload cannot be read or written.