@@ -157,6 +157,59 @@ Irregular (structure mode): `[a b c]` is `$:(a b c)`.
157157[p=0 q=%$]
158158```
159159
160+
161+### $< "bucgal"
162+
163+`[%bsld p=spec q=spec]`: Filters a pre-existing mold to obtain a mold
164+that excludes a particular structure.
165+
166+##### Syntax
167+
168+Regular: **2-fixed**.
169+
170+##### Discussion
171+
172+This can be used to obtain type(s) from a list of types `p` that do not satisfy a
173+requirement given by `q`.
174+
175+##### Examples
176+
177+```
178+> =foo $%([%bar p=@ud q=@ud] [%baz p=@ud])
179+> =m $<(%bar foo)
180+> (m [%bar 2 4])
181+ford: %ride failed to execute:
182+> (m [%baz 2])
183+[%baz p=2]
184+ ```
185+
186+
187+### $> "bucgar"
188+
189+`[%bsbn p=spec q=spec]`: Filters a pre-existing mold to obtain a mold
190+matching a particular structure.
191+
192+##### Syntax
193+
194+Regular: **2-fixed**.
195+
196+##### Discussion
197+
198+This can be used to obtain type(s) from a list of types `p` that satisfy a
199+requirement given by `q`.
200+
201+##### Examples
202+
203+```
204+> =foo $%([%bar p=@ud q=@ud] [%baz p=@ud])
205+> =m $>(%bar foo)
206+> (m [%bar 2 4])
207+[%bar p=2 q=4]
208+> (m [%baz 2])
209+ford: %ride failed to execute:
210+ ```
211+
212+
160213### $- "buchep"
161214
162215`[%bshp p=spec q=spec]`: structure that normalizes to an example gate.
@@ -394,4 +447,4 @@ ford: %ride failed to execute:
394447
395448~zod:dojo> $:a
396449%baz
397−```
450+```