Example files.

try/bin/app.hoon

@@ -0,0 +1,18 @@
+!:
+::  /=main=/bin/tach/hoon
+::
+=>  %=    .
+        +
+      =>  +
+      |%  
+      ++  word
+        %hello
+      --
+    ==
+|=  *
+|=  ~
+^-  bowl
+:_  ~  :_  ~
+:-  %$  
+!>
+"{(trip word)}, world"

try/bin/nock.hoon

@@ -6,17 +6,5 @@
 %+  sell  %noun::
 .*  a          ::  Replace the formula with your own
 :::::::::::::::::
-               ::  Formula: decrement
-[ 8 
-  [1 0] 
-  [ 8 
-    [ 1 
-      [ 6 
-        [5 [4 0 6] [0 7]] 
-        [0 6] 
-        [9 2 [0 2] [4 0 6] [0 7]]
-      ]
-    ]
-    [9 2 0 1]
-  ]
-]
+               ::  Formula: increment
+[4 0 1]