diff --git a/crossfire/codegen.template b/crossfire/codegen.template
index 3b36478..79831fd 100644
--- a/crossfire/codegen.template
+++ b/crossfire/codegen.template
@@ -34,13 +34,18 @@ typedef struct {
 
 int main() {
     char buf [ @(* 20 (vector-length pattern)) ];
+    @(for/list ([num (in-naturals)] [cset (in-vector pattern)])
+      @list{size_t @(format "i~a" num) ;
+            vartype @(format "v~a" num) ;
+
+      })
     @(for/list ([num (in-naturals)] [cset (in-vector pattern)])
       (define iter (format "i~a" num))
       (define viter (format "v~a" num))
       (define iset (format "iset~a" num))
       @list{
-        for (size_t @iter = 0; @iter < @iset @".length" ; @iter ++) @"{"
-          for (vartype @viter = @iset .values[ @iter ].start; @viter < @iset .values[ @iter ].end; @viter ++) @"{"
+        for (@iter = 0; @iter < @iset @".length" ; @iter ++) @"{"
+          for (@viter = @iset .values[ @iter ].start; @viter < @iset .values[ @iter ].end; @viter ++) @"{"
 
       })
 
@@ -48,9 +53,12 @@ int main() {
       (string-join (for/list ([i (in-range (vector-length pattern))]) (format "v~a" i)) ","))
     @(define fmt
       (string-join (for/list ([i (in-range (vector-length pattern))]) c-type-fmt) " "))
+l_inner:
 
     ssize_t res = snprintf(buf, sizeof(buf), @(format "\"~a\\n\"" fmt), @vs );
     fwrite(buf, res, 1, stdout);
 
     @(for/list ([cset (in-vector pattern)]) "}}")
+l_end:
+    return 0;
 }
diff --git a/crossfire/main.rkt b/crossfire/main.rkt
index 3fd434c..cf1c9fe 100644
--- a/crossfire/main.rkt
+++ b/crossfire/main.rkt
@@ -67,6 +67,23 @@
 
   (iset-merge (iset-insert iset start end)))
 
+(define (iset-count iset)
+  (for/sum ([ival (in-list iset)])
+    (- (cdr ival) (car ival))))
+
+;; converts a position of [0, iset-count) to 2 values
+;; - iset interval number
+;; - actual value within the interval
+(define (pos->iset-pos iset pos)
+  (when (empty? iset)
+    (error "iset-pos out of range"))
+  (match-define (cons (cons fs fe) r) iset)
+  (define delta (- fe fs))
+  (if (< pos delta)
+    (values 0 (+ fs pos))
+    (let-values ([(inum val) (pos->iset-pos r (- pos delta))])
+      (values (add1 inum) val))))
+
 (define (char->iset ch)
   (define cp (char->integer ch))
   (iset-add (make-iset) cp (add1 cp)))
@@ -128,10 +145,6 @@
 
 ;; pattern processing
 
-(define (iset-count iset)
-  (for/sum ([ival (in-list iset)])
-    (- (cdr ival) (car ival))))
-
 (define (pattern-count pattern)
   (for/fold ([sum 1]) ([p (in-vector pattern)])
     (* sum (iset-count p))))
@@ -139,19 +152,19 @@
 ;; design recipe violations follow
 ;; (sorry)
 ;; (i wanted this to be fast so i try to avoid spamming the heap)
-(define (pattern-generate pattern out-port)
-  (define len (vector-length pattern))
-  (define gen (make-bytes len))
-  (define (output gen)
-    (write-bytes gen out-port)
-    (printf "\n"))
-  (define (permute i gen)
-    (cond [(= i len) (output gen)]
-          [else
-            (for ([chr (in-set (vector-ref pattern i))])
-              (bytes-set! gen i chr)
-              (permute (add1 i) gen))]))
-  (permute 0 gen))
+; (define (pattern-generate pattern out-port)
+;   (define len (vector-length pattern))
+;   (define gen (make-bytes len))
+;   (define (output gen)
+;     (write-bytes gen out-port)
+;     (printf "\n"))
+;   (define (permute i gen)
+;     (cond [(= i len) (output gen)]
+;           [else
+;             (for ([chr (in-set (vector-ref pattern i))])
+;               (bytes-set! gen i chr)
+;               (permute (add1 i) gen))]))
+;   (permute 0 gen))
 
 ;; ok gamer move time
 (define-runtime-path codegen-template "codegen.template")