diff --git a/a b/a
new file mode 100644
index 0000000..e69de29
diff --git a/d b/d
new file mode 100644
index 0000000..e69de29
diff --git a/s b/s
new file mode 100644
index 0000000..e69de29
diff --git a/xx b/xx
new file mode 100644
index 0000000..e69de29