diff --git a/misc/all-graph/03-convert_graphml.py b/misc/all-graph/03-convert_graphml.py
index 941c294..c0f6ff7 100755
--- a/misc/all-graph/03-convert_graphml.py
+++ b/misc/all-graph/03-convert_graphml.py
@@ -1,5 +1,9 @@
 #!/usr/bin/env python3
 
+from __future__ import annotations
+
+import os
+import re
 import igraph as ig
 from lxml import etree
 from dataclasses import dataclass
@@ -17,22 +21,32 @@ class GraphML:
         src: str  # node id
         dst: str  # node id
 
-    def __init__(self, gid: str, graph: ig.Graph):
-        self.__gid = gid
-
-        self.__nodes = []
+    @dataclass(frozen=True)
+    class Graph:
+        name: str
+        nodes: list[GraphML.Node]
+        edges: list[GraphML.Edge]
+
+    @staticmethod
+    def __load(name: str, graph: ig.Graph) -> GraphML.Graph:
+        nodes = []
         id_len = len(str(graph.vcount() - 1))
         for index in range(graph.vcount()):
             info = graph.vs[index]
-            self.__nodes.append(GraphML.Node(f'n{index:0{id_len}d}', info['code'], info['step']))
+            nodes.append(GraphML.Node(f'n{index:0{id_len}d}', info['code'], info['step']))
 
-        self.__edges = []
+        edges = []
         for n1, n2 in graph.get_edgelist():
-            node_1 = self.__nodes[n1]
-            node_2 = self.__nodes[n2]
+            node_1 = nodes[n1]
+            node_2 = nodes[n2]
             if node_1.step < node_2.step:
                 node_1, node_2 = node_2, node_1
-            self.__edges.append(GraphML.Edge(node_1.id, node_2.id))
+            edges.append(GraphML.Edge(node_1.id, node_2.id))
+
+        return GraphML.Graph(name, nodes, edges)
+
+    def __init__(self, *graphs: tuple[str, ig.Graph]):
+        self.__graphs = [self.__load(*x) for x in graphs]
 
     def __dump_node(self, node: Node) -> etree.Element:
         node_xml = etree.Element('node', id=node.id)
@@ -43,46 +57,58 @@ class GraphML:
     def __dump_edge(self, edge: Edge) -> etree.Element:
         return etree.Element('edge', source=edge.src, target=edge.dst)
 
-    def __dump_graph(self) -> etree.Element:
-        graph_xml = etree.Element('graph', id=self.__gid, edgedefault='undirected')
-        for node in self.__nodes:
+    def __dump_graph(self, graph: Graph) -> etree.Element:
+        graph_xml = etree.Element('graph', id=graph.name, edgedefault='undirected')
+        for node in graph.nodes:
             graph_xml.append(self.__dump_node(node))
-        for edge in self.__edges:
+        for edge in graph.edges:
             graph_xml.append(self.__dump_edge(edge))
         return graph_xml
 
-    def build_and_save(self, output: str) -> None:
-        root = etree.Element('graphml', nsmap={
+    def save_graph(self, output: str) -> None:
+        graphml = etree.Element('graphml', nsmap={
             None: 'http://graphml.graphdrawing.org/xmlns',
             'xsi': 'http://www.w3.org/2001/XMLSchema-instance'
         })
-        root.set(
+        graphml.set(
             '{http://www.w3.org/2001/XMLSchema-instance}schemaLocation',
             'http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd'
         )
-
-        etree.SubElement(root, 'key', attrib={
+        etree.SubElement(graphml, 'key', attrib={
             'id': 'v_code',
             'for': 'node',
             'attr.name': 'code',
             'attr.type': 'string'
         })
-        etree.SubElement(root, 'key', attrib={
+        etree.SubElement(graphml, 'key', attrib={
             'id': 'v_step',
             'for': 'node',
             'attr.name': 'step',
             'attr.type': 'int'
         })
-        root.append(self.__dump_graph())
 
-        tree = etree.ElementTree(root)
-        tree.write(output, pretty_print=True, xml_declaration=True, encoding='utf-8')
+        for graph in self.__graphs:
+            graphml.append(self.__dump_graph(graph))
+        xml_tree = etree.ElementTree(graphml)
+        xml_tree.write(output, pretty_print=True, xml_declaration=True, encoding='utf-8')
+
+
+def to_graphml(inputs: list[tuple[str, str]], output: str) -> None:
+    print(f'Convert into {output}')
+    gml = GraphML(*((x, ig.Graph.Read_Pickle(y)) for x, y in inputs))
+    gml.save_graph(output)
+
 
+def convert_graphs(input_dir: str, output_dir: str) -> None:
+    files = [x.removesuffix('.pkl') for x in os.listdir(input_dir) if x.endswith('.pkl')]
+    tags = sorted(x for x in files if re.match(r'^\d\-\d\d(L|R|M)$', x))
 
-def to_graphml(tag: str, input: str, output: str) -> None:
-    gml = GraphML(tag, ig.Graph.Read_Pickle(input))
-    gml.build_and_save(output)
+    for tag in tags:
+        output_file = os.path.join(output_dir, f'{tag}.graphml')
+        pkls = sorted(x for x in files if x.startswith(tag))
+        to_graphml([(x, os.path.join(input_dir, f'{x}.pkl')) for x in pkls], output_file)
 
 
 if __name__ == "__main__":
-    to_graphml('0-00M-005X', 'output-ig/0-00M-005X_DAAFE0C.pkl', 'output-gml/0-00M-005X_DAAFE0C.graphml')
+    os.makedirs('output-gml', exist_ok=True)
+    convert_graphs('output-ig', 'output-gml')