diff --git a/analysis.ipynb b/analysis.ipynb
index 816acd1..2f3bede 100644
--- a/analysis.ipynb
+++ b/analysis.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 1,
    "outputs": [],
    "source": [
     "from __future__ import annotations\n",
@@ -23,14 +23,14 @@
    "metadata": {
     "collapsed": false,
     "ExecuteTime": {
-     "start_time": "2023-04-03T09:42:33.692594Z",
-     "end_time": "2023-04-03T09:42:34.664945Z"
+     "start_time": "2023-04-03T10:15:55.091702Z",
+     "end_time": "2023-04-03T10:15:55.098701Z"
     }
    }
   },
   {
    "cell_type": "code",
-   "execution_count": 14,
+   "execution_count": 2,
    "outputs": [],
    "source": [
     "fm = matplotlib.font_manager\n",
@@ -42,19 +42,19 @@
    "metadata": {
     "collapsed": false,
     "ExecuteTime": {
-     "start_time": "2023-04-03T09:56:39.022987Z",
-     "end_time": "2023-04-03T09:56:39.073867Z"
+     "start_time": "2023-04-03T10:15:55.100206Z",
+     "end_time": "2023-04-03T10:15:55.110153Z"
     }
    }
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 3,
    "metadata": {
     "collapsed": true,
     "ExecuteTime": {
-     "start_time": "2023-04-03T09:42:57.123275Z",
-     "end_time": "2023-04-03T09:43:48.116854Z"
+     "start_time": "2023-04-03T10:15:55.114460Z",
+     "end_time": "2023-04-03T10:16:41.049276Z"
     }
    },
    "outputs": [
@@ -62,8 +62,8 @@
      "name": "stderr",
      "output_type": "stream",
      "text": [
-      "Loading data: 100%|██████████| 135206/135206 [00:00<00:00, 185481.57it/s]\n",
-      "Loading json: 100%|██████████| 135205/135205 [00:49<00:00, 2705.04it/s]"
+      "Loading file list: 100%|██████████| 135206/135206 [00:00<00:00, 201355.38it/s]\n",
+      "Loading json: 100%|██████████| 135205/135205 [00:38<00:00, 3497.82it/s]\n"
      ]
     },
     {
@@ -72,13 +72,6 @@
      "text": [
       "一共有 135205 個訂單\n"
      ]
-    },
-    {
-     "name": "stderr",
-     "output_type": "stream",
-     "text": [
-      "\n"
-     ]
     }
    ],
    "source": [
@@ -91,7 +84,7 @@
     "def load_data():\n",
     "    dir = Path(toml.loads(Path('config.toml').read_text())['index_path'])\n",
     "    files = [(dir / f) for f in tq(os.listdir(dir), 'Loading file list') if f.endswith('.json')]\n",
-    "    return pmap(_helper, files, desc='Loading json')\n",
+    "    return smap(_helper, files, desc='Loading json')\n",
     "\n",
     "\n",
     "data = load_data()\n",
@@ -100,7 +93,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 4,
    "outputs": [],
    "source": [
     "delivery = json.loads(Path('data/delivery.json').read_text())\n",
@@ -118,14 +111,14 @@
    "metadata": {
     "collapsed": false,
     "ExecuteTime": {
-     "start_time": "2023-04-03T09:43:55.301846Z",
-     "end_time": "2023-04-03T09:43:59.965436Z"
+     "start_time": "2023-04-03T10:16:41.089229Z",
+     "end_time": "2023-04-03T10:16:41.474719Z"
     }
    }
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 5,
    "outputs": [
     {
      "name": "stdout",
@@ -175,14 +168,14 @@
    "metadata": {
     "collapsed": false,
     "ExecuteTime": {
-     "start_time": "2023-04-03T09:44:21.771663Z",
-     "end_time": "2023-04-03T09:44:22.250463Z"
+     "start_time": "2023-04-03T10:16:41.489723Z",
+     "end_time": "2023-04-03T10:16:42.064213Z"
     }
    }
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 6,
    "outputs": [
     {
      "name": "stdout",
@@ -223,14 +216,14 @@
    "metadata": {
     "collapsed": false,
     "ExecuteTime": {
-     "start_time": "2023-04-03T09:44:47.609827Z",
-     "end_time": "2023-04-03T09:44:48.180899Z"
+     "start_time": "2023-04-03T10:16:42.072640Z",
+     "end_time": "2023-04-03T10:16:42.541632Z"
     }
    }
   },
   {
    "cell_type": "code",
-   "execution_count": 18,
+   "execution_count": 7,
    "outputs": [
     {
      "name": "stdout",
@@ -306,14 +299,14 @@
    "metadata": {
     "collapsed": false,
     "ExecuteTime": {
-     "start_time": "2023-04-03T10:04:56.894525Z",
-     "end_time": "2023-04-03T10:05:02.681443Z"
+     "start_time": "2023-04-03T10:16:42.540837Z",
+     "end_time": "2023-04-03T10:16:48.065746Z"
     }
    }
   },
   {
    "cell_type": "code",
-   "execution_count": 13,
+   "execution_count": 8,
    "outputs": [
     {
      "name": "stdout",
@@ -339,14 +332,14 @@
    "metadata": {
     "collapsed": false,
     "ExecuteTime": {
-     "start_time": "2023-04-03T09:48:52.447143Z",
-     "end_time": "2023-04-03T09:48:58.155815Z"
+     "start_time": "2023-04-03T10:16:47.703948Z",
+     "end_time": "2023-04-03T10:16:53.170435Z"
     }
    }
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 9,
    "outputs": [
     {
      "name": "stdout",
@@ -372,8 +365,8 @@
    "metadata": {
     "collapsed": false,
     "ExecuteTime": {
-     "start_time": "2023-04-03T10:05:02.679744Z",
-     "end_time": "2023-04-03T10:05:07.569168Z"
+     "start_time": "2023-04-03T10:16:52.688834Z",
+     "end_time": "2023-04-03T10:16:57.594972Z"
     }
    }
   }