diff --git a/.github/workflows/cargo-test.yml b/.github/workflows/cargo-test.yml
index 44a3764..42021b1 100644
--- a/.github/workflows/cargo-test.yml
+++ b/.github/workflows/cargo-test.yml
@@ -18,6 +18,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           fetch-depth: '0'
+          ref: ${{ github.event.pull_request.head.ref }}
       - name: Cache Cargo dependencies
         uses: actions/cache@v2
         with:
@@ -52,7 +53,7 @@ jobs:
           cp ./target/debug/gossiphs ./gossiphs
           
           cd tree-sitter
-          time ../gossiphs relation
+          time ../gossiphs relation --symbol-csv test-symbol.csv
           cd ..
           
           cd typescript-eslint
diff --git a/src/graph.rs b/src/graph.rs
index 9e97807..4e1b0f8 100644
--- a/src/graph.rs
+++ b/src/graph.rs
@@ -1,5 +1,5 @@
 use crate::extractor::Extractor;
-use crate::symbol::{Symbol, SymbolGraph, SymbolKind};
+use crate::symbol::{DefRefPair, Symbol, SymbolGraph, SymbolKind};
 use cupido::collector::config::Collect;
 use cupido::collector::config::{get_collector, Config};
 use cupido::relation::graph::RelationGraph as CupidoRelationGraph;
@@ -12,7 +12,7 @@ use std::collections::{BTreeMap, HashMap, HashSet};
 use std::fs;
 use std::path::Path;
 use std::time::Instant;
-use tracing::{debug, info, warn};
+use tracing::{debug, info};
 
 pub struct FileContext {
     pub path: String,
@@ -491,36 +491,6 @@ impl Graph {
         contexts
     }
 
-    pub fn symbols_between_files(&self, src: &String, dst: &String) -> Vec<RelatedSymbol> {
-        if !self.files().contains(src) || !self.files().contains(dst) {
-            return Vec::new();
-        }
-
-        let mut related_symbols: Vec<RelatedSymbol> = vec![];
-
-        // other files -> this file
-        let definitions_in_file = self.symbol_graph.list_definitions(src);
-        let definition_count = definitions_in_file.len();
-
-        definitions_in_file.iter().for_each(|def| {
-            self.symbol_graph
-                .list_references_by_definition(&def.id())
-                .iter()
-                .filter(|(each, _)| {
-                    return each.file.eq(dst);
-                })
-                .for_each(|(each_ref, weight)| {
-                    let real_weight = std::cmp::max(weight / definition_count, 1);
-                    related_symbols.push(RelatedSymbol {
-                        symbol: each_ref.clone(),
-                        weight: real_weight,
-                    })
-                });
-        });
-
-        related_symbols
-    }
-
     pub fn related_symbols(&self, symbol: &Symbol) -> HashMap<Symbol, usize> {
         match symbol.kind {
             SymbolKind::DEF => self
@@ -545,6 +515,13 @@ impl Graph {
             .collect();
         FileMetadata { symbols }
     }
+
+    pub fn pairs_between_files(&self, src_file: &String, dst_file: &String) -> Vec<DefRefPair> {
+        if !self.files().contains(src_file) || !self.files().contains(dst_file) {
+            return Vec::new();
+        }
+        self.symbol_graph.pairs_between_files(src_file, dst_file)
+    }
 }
 
 #[derive(Serialize, Deserialize, Clone)]
@@ -607,6 +584,7 @@ impl GraphConfig {
 #[cfg(test)]
 mod tests {
     use crate::graph::{Graph, GraphConfig};
+    use crate::symbol::DefRefPair;
     use petgraph::visit::EdgeRef;
     use tracing::{debug, info};
 
@@ -688,16 +666,25 @@ mod tests {
     }
 
     #[test]
-    fn between_files() {
+    fn paths() {
+        tracing_subscriber::fmt::init();
         let mut config = GraphConfig::default();
         config.project_path = String::from(".");
         let g = Graph::from(config);
-        let symbols = g.symbols_between_files(
-            &String::from("src/rule.rs"),
+        let symbols: Vec<DefRefPair> = g.pairs_between_files(
             &String::from("src/extractor.rs"),
+            &String::from("src/graph.rs"),
         );
-        symbols.iter().for_each(|item| {
-            info!("{:?}: {}", item.symbol, item.weight);
+        symbols.iter().for_each(|pair| {
+            info!(
+                "{} {} {} -> {} {} {}",
+                pair.src_symbol.file,
+                pair.src_symbol.name,
+                pair.src_symbol.range.start_point.row,
+                pair.dst_symbol.file,
+                pair.dst_symbol.name,
+                pair.dst_symbol.range.start_point.row
+            );
         });
     }
 }
diff --git a/src/main.rs b/src/main.rs
index 0cf530a..390cf7f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -6,7 +6,7 @@ use gossiphs::graph::{Graph, GraphConfig, RelatedFileContext};
 use gossiphs::server::{server_main, ServerConfig};
 use inquire::Text;
 use serde::{Deserialize, Serialize};
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 use std::fs;
 use std::fs::File;
 use std::io::Write;
@@ -104,6 +104,10 @@ struct RelationCommand {
     #[clap(long)]
     #[clap(default_value = "output.csv")]
     csv: String,
+
+    #[clap(long)]
+    #[clap(default_value = "")]
+    symbol_csv: String,
 }
 
 #[derive(Parser, Debug)]
@@ -245,7 +249,6 @@ fn handle_relation(relation_cmd: RelationCommand) {
         Ok(writer) => writer,
         Err(e) => panic!("Failed to create CSV writer: {}", e),
     };
-
     // Write the header row
     let mut header = vec!["".to_string()];
     header.extend(files.clone());
@@ -253,23 +256,57 @@ fn handle_relation(relation_cmd: RelationCommand) {
         panic!("Failed to write CSV header: {}", e);
     }
 
+    let mut symbol_wtr_opts = None;
+    if !relation_cmd.symbol_csv.is_empty() {
+        let symbol_wtr_result = Writer::from_path(relation_cmd.symbol_csv);
+        symbol_wtr_opts = match symbol_wtr_result {
+            Ok(writer) => Some(writer),
+            Err(e) => panic!("Failed to create CSV writer: {}", e),
+        };
+        let mut header = vec!["".to_string()];
+        header.extend(files.clone());
+        if let Some(symbol_wtr) = symbol_wtr_opts.as_mut() {
+            symbol_wtr
+                .write_record(&header)
+                .expect("Failed to write header to symbol_wtr");
+        }
+    }
+
     // Write each row
     for file in &files {
         let mut row = vec![file.clone()];
-        let related_files = g.related_files(file);
-        let related_files_map: HashMap<_, _> = related_files
+        let mut pair_row = vec![file.clone()];
+        let related_files_map: HashMap<_, _> = g
+            .related_files(file)
             .into_iter()
             .map(|rf| (rf.name, rf.score))
             .collect();
 
         for related_file in &files {
-            let score = related_files_map
-                .get(related_file)
-                .unwrap_or(&0)
-                .to_string();
-            row.push(score);
+            let score = related_files_map.get(related_file).unwrap_or(&0);
+            row.push(score.to_string());
+
+            if symbol_wtr_opts.is_some() {
+                if score > &0 {
+                    let pairs = g
+                        .pairs_between_files(&file, &related_file)
+                        .iter()
+                        .map(|each| each.src_symbol.name.clone())
+                        .collect::<HashSet<String>>()
+                        .into_iter()
+                        .collect::<Vec<String>>();
+                    pair_row.push(pairs.join("|"));
+                } else {
+                    pair_row.push(String::new());
+                }
+            }
         }
         wtr.write_record(&row).expect("Failed to write record");
+        if let Some(symbol_wtr) = symbol_wtr_opts.as_mut() {
+            symbol_wtr
+                .write_record(&pair_row)
+                .expect("Failed to write pair_row to symbol_wtr");
+        }
     }
 
     // Flush the writer to ensure all data is written
@@ -665,8 +702,11 @@ fn diff_test() {
 
 #[test]
 fn relation_test() {
+    let mut config = CommonOptions::default();
+    config.project_path = ".".parse().unwrap();
     handle_relation(RelationCommand {
-        common_options: CommonOptions::default(),
+        common_options: config,
         csv: "ok.csv".to_string(),
+        symbol_csv: "ok1.csv".to_string(),
     })
 }
diff --git a/src/rule.rs b/src/rule.rs
index e6c0a9f..620836e 100644
--- a/src/rule.rs
+++ b/src/rule.rs
@@ -16,9 +16,24 @@ pub fn get_rule(extractor_type: &Extractor) -> Rule {
         Extractor::Rust => Rule {
             import_grammar: r#"
 (identifier) @variable_name
+(call_expression
+  function: (identifier) @function)
+(call_expression
+  function: (field_expression
+    field: (field_identifier) @function.method))
+(call_expression
+  function: (scoped_identifier
+    "::"
+    name: (identifier) @function))
 "#,
             export_grammar: r#"
 (function_item name: (identifier) @exported_symbol)
+(function_signature_item name: (identifier) @exported_symbol)
+(generic_function
+  function: (identifier) @exported_symbol)
+(generic_function
+  function: (scoped_identifier
+    name: (identifier) @exported_symbol))
 "#,
         },
 
diff --git a/src/symbol.rs b/src/symbol.rs
index 05aa02c..c0011b0 100644
--- a/src/symbol.rs
+++ b/src/symbol.rs
@@ -1,3 +1,4 @@
+use petgraph::algo::all_simple_paths;
 use petgraph::graph::{NodeIndex, UnGraph};
 use petgraph::prelude::EdgeRef;
 use serde::{Deserialize, Serialize};
@@ -248,4 +249,32 @@ impl SymbolGraph {
         let ref_index = self.symbol_mapping.get(symbol_id).unwrap();
         self.neighbor_symbols(*ref_index)
     }
+
+    pub fn pairs_between_files(&self, src_file: &String, dst_file: &String) -> Vec<DefRefPair> {
+        if let (Some(src_index), Some(dst_index)) = (
+            self.file_mapping.get(src_file),
+            self.file_mapping.get(dst_file),
+        ) {
+            // file -> symbol -> symbol -> file
+            // so at most 2
+            let pairs: Vec<_> =
+                all_simple_paths::<Vec<_>, _>(&self.g, *src_index, *dst_index, 1, Some(2))
+                    .filter(|each| each.len() == 4)
+                    .map(|each| DefRefPair {
+                        src_symbol: self.g[each[1]].get_symbol().unwrap().clone(),
+                        dst_symbol: self.g[each[2]].get_symbol().unwrap().clone(),
+                    })
+                    .filter(|each| each.src_symbol.kind == SymbolKind::DEF)
+                    .collect();
+            return pairs;
+        }
+
+        // fallback
+        vec![]
+    }
+}
+
+pub struct DefRefPair {
+    pub src_symbol: Symbol,
+    pub dst_symbol: Symbol,
 }