diff --git a/21/f6724b14b0662bba13cf5e2fd0680ca4e00ab8 b/21/f6724b14b0662bba13cf5e2fd0680ca4e00ab8
new file mode 100644
index 0000000..a4af7f5
--- /dev/null
+++ b/21/f6724b14b0662bba13cf5e2fd0680ca4e00ab8
@@ -0,0 +1 @@
+{"channels":[null, "preview"]}