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9+Let's take some examples from `hoon.hoon`. `|$` is a new rune as of the writing of this document so you may see this spelled in slightly different way if you don't have the latest version of `hoon.hoon`.
17+Here is a very simple mold builder. It takes two molds and produces a mold that is a pair of those with the faces `p` and `q`. `|$` is the mold builder rune which takes a list of molds and produces a mold. An example of using this would be `(pair @ud @ud)` which would produce a mold for a cell of `@ud` and `@ud`.
27+`each` is very slightly more complicated than `pair` was but not by much. `$%` is a rune that is a tagged union. The mold produced by this will match either `this` or `that`. An example of this would be `(each @ud @tas)` which will match either an `@ud` or a `@tas`.
32+ $@(~ [i=item t=(list item)])
35+Here is a mold builder you've used previously. `$@` is a rune that will match the first thing if it's sample is an atom and the second if the sample is a cell. You should be familiar at this point that a `list` is either `~` or a pair of an item and a list of item.
41+ [i/item t/(list item)]
44+`lest` you may have heard of as a "non empty list." You can see that it lacks the `~` case that `list` has but it matches the second part of the `list` definition. Remember that Hoon types are defined by shape. `list` could also have been defined in terms of `lest` like this
52+Another possible way to write it could have been
60+Any of these would be equivalent.