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add example to tree addressing peg doc #261

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add example to tree addressing peg doc #261

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7 changes: 7 additions & 0 deletions content/hoon/stdlib/1b.md
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Expand Up @@ -289,6 +289,13 @@ An `$atom`.
%2
```

```
> %+ peg
(add (mul 2 +:(~(dig by outer) outer-key)) 1)
(add (mul 2 +:(~(dig by inner) inner-key)) 1)
477
```

#### Discussion

In other words, the subtree at address `.a` is treated as a tree in its own right (starting with root `+1`, head `+2`, and tail `+3`). Relative address `.b` is found with respect to `.a`, and then its absolute address, within the greater tree, is returned.
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