diff --git a/forge/sf.lisp b/forge/sf.lisp
index ecb65a9..fcd43f9 100644
--- a/forge/sf.lisp
+++ b/forge/sf.lisp
@@ -7,13 +7,15 @@
   (:local-nicknames (:iter :scopes/util/iter))
   (:export #:*input* #:*stack*
            #:exec-list #:exec-input
-           #:reg #:reg2
+           #:lit #:reg #:reg2
            #:pushd #:popd #:peekd))
 
 (in-package :scopes/forge/sf)
 
 (defvar *stack* nil)
 (defvar *input* nil)
+(defvar *buffer* nil)
+(defvar *code* nil)
 
 ;;;; core definitions
 
@@ -21,30 +23,53 @@
   (:method ((it t))
     (pushd it))
   (:method ((it symbol))
-    (call-item (symbol-value it))))
+    (exec-item (symbol-value it))))
 
-(defgeneric comp-item (it))
+(defgeneric comp-item (it)
+  (:method ((it t))
+    (push #'lit *buffer*)
+    (push it *buffer*))
+  (:method ((it symbol))
+    (comp-item (symbol-value it))))
 
-(defgeneric call-item (it))
+;;;; class word
 
 (defclass word () 
   ((func :reader func :initarg :func)))
 
-(defmethod call-item ((w word))
+(defmethod exec-item ((w word))
   (funcall (func w)))
 
+(defmethod comp-item ((w word))
+  (push (func w) *buffer*))
+
+;;;; class comp-word
+
 (defclass comp-word (word) ())
 
+(defmethod comp-item ((w word))
+  (funcall (func w)))
+
+;;;; functions
+
 (defun exec-list (lst)
-  (setf *input* (make-instance 'iter:list-iterator :data lst))
-  (exec-input))
+  (let ((*input* (make-instance 'iter:list-iterator :data lst)))
+    (exec-input)))
 
 (defun exec-input ()
   (iter:process *input* #'exec-item))
 
+(defun comp-input ()
+  (let ((*buffer* nil))
+    (iter:process *input* #'comp-item)
+    (pushd (reverse *buffer*))))
+
+(defun call (code)
+  (let ((*code* (make-instance 'iter:list-iterator :data code)))
+    (iter:process *code* #'funcall)))
+
 (defun reg (sym fn)
   (setf (symbol-value sym) (make-instance 'word :func fn)))
-  ;(setf (symbol-value sym) fn))
 
 (defun reg2 (sym fn)
   (reg sym #'(lambda () (pushd (funcall fn (popd) (popd))))))
@@ -58,13 +83,16 @@
 (defun peekd ()
   (car *stack*))
 
+(defun lit () 
+  (pushd (iter:next-value *code*)))
+
 ;;;; builtins
 
 (defpackage :sf-builtin
   (:use :common-lisp)
   (:local-nicknames (:f :scopes/forge/sf)
                     (:iter :scopes/util/iter))
-  (:export #:add #:mul #:dup #:in #:?))
+  (:export #:add #:mul #:dup #:in #:? #:lit))
 
 (in-package :sf-builtin)
 
@@ -74,3 +102,5 @@
 (f:reg 'dup #'(lambda () (f:pushd (f:peekd))))
 
 (f:reg 'in #'(lambda () (f:pushd (iter:next-value f:*input*))))
+
+(f:reg 'lit #'f:lit)