diff --git a/src/wide.rs b/src/wide.rs
index 4992a5b..a468a0f 100644
--- a/src/wide.rs
+++ b/src/wide.rs
@@ -1,3 +1,6 @@
+use std::cell::RefCell;
+use std::rc::Rc;
+use std::rc::Weak;
 use std::{fmt::Display, str::FromStr};
 
 use nom::{
@@ -22,10 +25,118 @@ pub struct Addresses<'a> {
     addresses: Vec<Address<'a>>,
 }
 
+pub struct TreeNode<'a> {
+    parent: Option<Weak<RefCell<TreeNode<'a>>>>,
+    children: Vec<Rc<RefCell<TreeNode<'a>>>>,
+
+    token: Token<'a>,
+}
+
 impl<'a> Addresses<'a> {
     // fn to_compact_tokens(&self) -> impl Iterator<Item=Token<'a>> {
 
     // }
+
+    fn from_tokens(mut tokens: Vec<Token>) -> Result<Self, Error> {
+        // 123 and 456 a b c
+
+        // First, flip the order
+        tokens.reverse();
+        // c b a 456 and 123
+
+        // Next, build the tree
+        let mut depth = 0;
+
+        // let mut root_node = Rc::new(RefCell::new(TreeNode {
+        //     parent: None,
+        //     children: vec![],
+        // }));
+
+        let mut ret = vec![];
+        let mut last_node = None;
+
+        for token in tokens.into_iter() {
+            match token {
+                Token::Word(_) => {
+                    // The number must be inserted at depth 3 only
+                    if depth >= 3 {
+                        panic!("{token:?} found at depth {depth}");
+                    }
+
+                    let parent = last_node.as_ref().map(|ln| Rc::downgrade(&ln));
+                    let children = vec![];
+
+                    let new_node = Rc::new(RefCell::new(TreeNode {
+                        parent,
+                        children,
+                        token,
+                    }));
+
+                    if let Some(ln) = last_node.as_ref() {
+                        // Now add the child
+                        ln.borrow_mut().children.push(Rc::clone(&new_node));
+                    } else {
+                        // This is the first node
+                        ret.push(Rc::clone(&new_node));
+                    }
+
+                    depth += 1;
+                    last_node = Some(new_node);
+                }
+                Token::Number(_) => {
+                    // The number must be inserted at depth 3 only
+                    if depth != 3 {
+                        panic!("{token:?} found at depth {depth}");
+                    }
+
+                    let parent = last_node.as_ref().map(|ln| Rc::downgrade(&ln));
+                    let children = vec![];
+
+                    let new_node = Rc::new(RefCell::new(TreeNode {
+                        parent,
+                        children,
+                        token,
+                    }));
+
+                    if let Some(ln) = last_node.as_ref() {
+                        // Now add the child
+                        ln.borrow_mut().children.push(Rc::clone(&new_node));
+                    } else {
+                        // This is the first node
+                        ret.push(Rc::clone(&new_node));
+                    }
+
+                    depth += 1;
+                    last_node = Some(new_node);
+                }
+                Token::WideSeparator => {
+                    // 123 and 999 a and 456 b c d
+                    // Tree:
+                    //       d
+                    //       c
+                    //    a      b
+                    // 123 999  456
+                    //
+                    // last creaed: 123 last_created_depth=  depth=3
+                    // and
+                    // last creaed: 999 last_created_depth=3 depth=3
+                    // last creaed: a   last_created_depth=3 depth=2
+                    // and
+                    // last_creaed: 456 last_created_depth=2 depth=3
+                    // last_creaed: b   last_created_depth=3 depth=2
+
+                    // d c b 456 and a 999 and 123
+                    // Tree:
+                    // d   Depth=0
+                    // c   Depth=1
+                    // b   Depth=2
+                    // 456   Depth=0
+                }
+            }
+        }
+
+        todo![]
+    }
 }
 
 impl<'a> From<Vec<Address<'a>>> for Addresses<'a> {