diff --git a/seq-test.scm b/seq-test.scm
new file mode 100644
index 00000000..08f48506
--- /dev/null
+++ b/seq-test.scm
@@ -0,0 +1,61 @@
+;; This is a temporary file for testing
+(import (scheme base) (scheme write)
+(scheme cyclone transforms)
+)
+
+(define-c symbol<?
+  "(void *data, int argc, closure _, object k, object sym1, object sym2)"
+  "
+     Cyc_check_sym(data, sym1);
+     Cyc_check_sym(data, sym2);
+     object result = (strcmp(symbol_desc(sym1), symbol_desc(sym2)) < 0) 
+                     ? boolean_t : boolean_f;
+     return_closcall1(data, k, result);
+  "
+  "(void *data, object ptr, object sym1, object sym2)"
+  " 
+     Cyc_check_sym(data, sym1);
+     Cyc_check_sym(data, sym2);
+     object result = (strcmp(symbol_desc(sym1), symbol_desc(sym2)) < 0) 
+                     ? boolean_t : boolean_f;
+     return result;
+  ")
+
+(define (insert sym S)
+  (if (not (pair? S))
+      (list sym)
+      (cond
+        ((eq? sym (car S))       S)
+        ((symbol<? sym (car S))  (cons sym S))
+        (else (insert sym (cdr S))))))
+        ;(else (cons (car S) (insert sym (cdr S)))))))
+;
+;(define (union set1 set2)
+;  (inner-union set1 (dedupe set2)))
+;
+;(define (inner-union set1 set2)
+;  ; NOTE: This should be implemented as merge for efficiency.
+;  (if (not (pair? set1))
+;      set2
+;      (insert (car set1) (inner-union (cdr set1) set2))))
+;
+;;; Remove consecutive duplicates from a list
+;(define (dedupe lis)
+;  (cond
+;    ((null? lis) lis)
+;    ((null? (cdr lis)) lis)
+;    ((eq? (car lis) (cadr lis))
+;     (dedupe (cdr lis)))
+;    (else
+;      (cons (car lis) (dedupe (cdr lis))))))
+;
+;(write (union '(a a a a b b c c c) '()))
+;(write (union '(a b c) '(a a a a b b c c c) ))
+
+(define (union set1 set2)
+  ; NOTE: This should be implemented as merge for efficiency.
+  (if (not (pair? set1))
+      set2
+      (insert 'todo #;(car set1) (union (cdr set1) set2))))
+
+(write (union '(a b) '(c d)))