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diff --git a/grading/threads/join-quick.c b/grading/threads/join-quick.c
new file mode 100644
index 0000000..78f1e3f
--- /dev/null
+++ b/grading/threads/join-quick.c
@@ -0,0 +1,68 @@
+/* Problem 1-2: Join tests.
+
+   Based on a test originally submitted for Stanford's CS 140 in
+   winter 1998 by Rob Baesman <rbaesman@cs.stanford.edu>, Ben
+   Taskar <btaskar@cs.stanford.edu>, and Toli Kuznets
+   <tolik@cs.stanford.edu>.  Later modified by shiangc, yph, and
+   arens. */
+#include "threads/test.h"
+#include <stdio.h>
+#include "threads/interrupt.h"
+#include "threads/thread.h"
+
+static void quick_test (void);
+
+void
+test (void) 
+{
+  quick_test ();
+}
+
+static thread_func quick_thread_func;
+static thread_func simple_thread_func;
+
+static void
+quick_test (void) 
+{
+  tid_t tid2;
+  
+  printf ("\n"
+          "Testing quick join.\n"
+          "Thread 2 should finish before thread 3 starts.\n");
+
+  tid2 = thread_create ("2", PRI_DEFAULT, quick_thread_func, "2");
+  thread_yield ();
+  thread_join (tid2);
+  simple_thread_func ("3");
+  printf ("Quick join test done.\n");
+}
+
+void 
+quick_thread_func (void *name_) 
+{
+  const char *name = name_;
+  int i;
+
+  intr_disable ();
+
+  for (i = 0; i < 5; i++) 
+    {
+      printf ("Thread %s iteration %d\n", name, i);
+      thread_yield ();
+    }
+  printf ("Thread %s done!\n", name);
+}
+
+void 
+simple_thread_func (void *name_) 
+{
+  const char *name = name_;
+  int i;
+  
+  for (i = 0; i < 5; i++) 
+    {
+      printf ("Thread %s iteration %d\n", name, i);
+      thread_yield ();
+    }
+  printf ("Thread %s done!\n", name);
+}