prefer singular dir names

example/ex1.txt

@@ -0,0 +1,5 @@
+original text
+#placeholder<hw> BEGIN
+hello world
+#placeholder<hw> END
+some more original text

example/ex2.cpp

@@ -0,0 +1,7 @@
+#include <stdio.h>
+signed main(){
+	// #placeholder<code> BEGIN
+	puts(hello world);
+	// #placeholder<code> END
+	return 0;
+}

example/gnu.sh

@@ -2,7 +2,7 @@
 
 echo start
 
-#placeholder<@gnu-tofile-payload>
+#placeholder<@gnu-tofile-payload> COLLAPSED
 
 echo start
 

examples/ex1.txt

@@ -1,3 +0,0 @@
-original text
-#placeholder<hw> COLLAPSED
-some more original text

examples/ex2.cpp

@@ -1,5 +0,0 @@
-#include <stdio.h>
-signed main(){
-	// #placeholder<code> COLLAPSED
-	return 0;
-}