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1# `:book, $%, "buctis", {$book p/(list moss)}`
3Tagged union
5Product: a mold producing the tagged union of the molds in
6`p`, all of which must be of the form `:bank(stem bulb)`, where
7`stem` is an atomic mold.
9Regular form: *running*.
11Examples:
13```
14~zod:dojo> =a :book({$foo p/@ud q/@ud} {$bar p/@ud})
16~zod:dojo> (a [%bar 37])
17[%bar p=37]
19~zod:dojo> $:a
20[%foo p=0 q=0]~
21```