diff --git a/brood/src/algo/edit.rs b/brood/src/algo/edit.rs
index 2b44298..2be0c0a 100644
--- a/brood/src/algo/edit.rs
+++ b/brood/src/algo/edit.rs
@@ -72,3 +72,26 @@ pub fn resolve_redirects(data: &mut Data) {
         }
     }
 }
+
+pub fn invert(data: &mut Data) {
+    let links = mem::take(&mut data.links);
+    let graph = mem::take(&mut data.graph);
+
+    let mut edges = graph
+        .edges()
+        .zip(links)
+        .map(|((source, target), link)| (source, target, link))
+        .collect::<Vec<_>>();
+
+    edges.sort_by_key(|(_, target, _)| *target);
+
+    let mut edges = edges.into_iter().peekable();
+    for node in graph.nodes() {
+        data.graph.add_node();
+        while edges.peek().is_some_and(|(_, target, _)| *target <= node) {
+            let (source, _, link) = edges.next().unwrap();
+            data.graph.add_edge(source);
+            data.links.push(link);
+        }
+    }
+}
diff --git a/brood/src/main.rs b/brood/src/main.rs
index f0e1a30..757695b 100644
--- a/brood/src/main.rs
+++ b/brood/src/main.rs
@@ -28,6 +28,10 @@ struct Args {
     in_structure: Option<bool>,
     #[arg(long, short = 'R')]
     resolve_redirects: bool,
+    #[arg(long, short = 'I')]
+    invert_edges: bool,
+    #[arg(long, short)]
+    check_consistency: bool,
 }
 
 fn main() -> io::Result<()> {
@@ -38,6 +42,7 @@ fn main() -> io::Result<()> {
     }
 
     println!(">> Import");
+    println!("> Reading data");
     let mut data = Data::read_from_file(&args.datafile)?;
 
     if args.in_parens.is_some() || args.in_structure.is_some() {
@@ -53,6 +58,16 @@ fn main() -> io::Result<()> {
         algo::resolve_redirects(&mut data);
     }
 
+    if args.invert_edges {
+        println!("> Inverting edges");
+        algo::invert(&mut data);
+    }
+
+    if args.check_consistency {
+        println!("> Checking consistencey");
+        data.check_consistency();
+    }
+
     match args.command {
         Command::Ingest(_) => unreachable!(),
         Command::Export(cmd) => cmd.run(data),