diff --git a/src/main.rs b/src/main.rs
index 14e8ddf..d347d20 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -115,7 +115,7 @@ impl RoyaltyTree {
     	        let d1=lazy*self.weight_here(index)/self.weight_here_below(index);
 		let d02=lazy-d1;
 		let index_left =wt_left (index).unwrap();
-		let index_right=wt_right(index).unwrap();
+		let index_right=wt_right_edge(index,self.tree.len()).unwrap();
 		let d0=d02*self.weight_here_below(index_left)/self.weight_below(index);
 		let d2=d02-d0;
 		assert!(lazy==d0+d1+d2,"Distributing amounts that don't add up.");
@@ -459,8 +459,19 @@ fn wt_left(index:usize) -> Option<usize> {
     if level>0 { Some(index-(1<<(wt_level(index)-1))) } else { None }
     }
 
-fn wt_first_left(index: usize, edge: usize) -> Option<usize> { // Includes edge
-    
+fn wt_right_edge(index: usize, edge: usize) -> Option<usize> { // Less than edge
+    if index&1==0 { None }
+    else {
+        let mut r=wt_right(index).unwrap();
+	if r<edge { Some(r) }
+	else {
+	    while r&1==1 {
+	        if r<edge { return Some(r); }
+                else { r=wt_left(r).unwrap(); }
+		}
+            if r<edge { Some(r) } else { None }
+	    }
+	}
     }
 
 fn wt_right(index:usize) -> Option<usize> {
@@ -498,7 +509,7 @@ fn tree_stuff() {
 
 fn royalty_stuff() {
     let mut rt=RoyaltyTree::new();
-    for _ in 0..6 {
+    for _ in 0..20 {
         let index=rt.insert(FiNum::new_i32(10));
 	rt.add_royalty(FiNum::new_i32(24))
 	}