diff --git a/src/03_lab.md b/src/03_facility.md
similarity index 100%
rename from src/03_lab.md
rename to src/03_facility.md
diff --git a/src/04_system.rs b/src/04_system.rs
new file mode 100644
index 0000000..1534929
--- /dev/null
+++ b/src/04_system.rs
@@ -0,0 +1,8 @@
+fn search() {
+    let facility = Faciltity::current();
+    let safe = facility.systems.db.sweep();
+    match safe {
+        false => freak_the_fuck_out(),
+        _ => (),
+    }
+}
diff --git a/src/_path.md b/src/_path.md
index ff58ef8..17a3357 100644
--- a/src/_path.md
+++ b/src/_path.md
@@ -5,6 +5,7 @@ the encounter
 the commute
 into the system
     evading the competition
+    chapter.rs
 feierabend
     the film
     more people going south
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..6121442 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,6 @@
+mod system;
+use system::search;
+
 fn main() {
-    println!("Hello, world!");
+    search()
 }
diff --git a/src/system.rs b/src/system.rs
new file mode 100644
index 0000000..f8a6b9b
--- /dev/null
+++ b/src/system.rs
@@ -0,0 +1,29 @@
+use std::{thread::AccessError};
+
+#[derive(Default)]
+struct Database {}
+impl Database {
+    fn sweep(self) -> Result<(), AccessError>{
+        Ok(())
+    }
+}
+
+#[derive(Default)]
+struct Nodes {}
+
+#[derive(Default)]
+struct Systems {
+    db: Database,
+    nodes: Nodes,
+}
+
+#[derive(Default)]
+struct Faciltity {
+    systems: Systems
+}
+
+pub fn search() {
+    let facility = Faciltity::default();
+    let safe = facility.systems.db.sweep();
+    unimplemented!();
+}