diff --git a/exl/hw.fzl b/exl/hw.fzs
similarity index 100%
rename from exl/hw.fzl
rename to exl/hw.fzs
diff --git a/exl/print_empty.fzs b/exl/print_empty.fzs
new file mode 100644
index 0000000..a9baaa0
--- /dev/null
+++ b/exl/print_empty.fzs
@@ -0,0 +1 @@
+printline("")
diff --git a/exl/problematic_hw.fzs b/exl/problematic_hw.fzs
new file mode 100644
index 0000000..88c437d
--- /dev/null
+++ b/exl/problematic_hw.fzs
@@ -0,0 +1 @@
+printline("hello)