diff --git a/glist/glist.go b/glist/glist.go
new file mode 100644
index 0000000..b049a4a
--- /dev/null
+++ b/glist/glist.go
@@ -0,0 +1,105 @@
+package glist
+
+import (
+	"encoding/json"
+	"fmt"
+	"sync"
+)
+
+type Entry struct {
+	Text    string `json:"text"`
+	Checked bool   `json:"checked"`
+}
+
+type GList struct {
+	AllMsgCounter int        `json:"-"`
+	Mutex         sync.Mutex `json:"-"`
+	ChatID        int        `json:"chat_id"`
+	MessageID     *int       `json:"message_id"`
+	Items         []Entry    `json:"items"`
+}
+
+func NewGList(chatID int, items ...string) *GList {
+	g := GList{ChatID: chatID}
+	for _, text := range items {
+		g.Items = append(g.Items, Entry{text, false})
+	}
+	return &g
+}
+
+func (g *GList) Add(text string) error {
+	for _, item := range g.Items {
+		if item.Text == text {
+			return fmt.Errorf("dupe:%s", text)
+		}
+	}
+	g.Items = append(g.Items, Entry{text, false})
+	return nil
+}
+
+func (g *GList) Toggle(text string) error {
+	for i, item := range g.Items {
+		if item.Text == text {
+			g.Items[i].Checked = !g.Items[i].Checked
+			return nil
+		}
+	}
+	return fmt.Errorf("not found:%s", text)
+}
+
+func (g *GList) ClearChecked() {
+	var remaining []Entry
+	for _, item := range g.Items {
+		if !item.Checked {
+			remaining = append(remaining, item)
+		}
+	}
+	g.Items = remaining
+}
+
+type button struct {
+	Text         string `json:"text"`
+	CallbackData string `json:"callback_data"`
+}
+
+type newListReq struct {
+	ChatID      int    `json:"chat_id"`
+	MessageID   *int   `json:"message_id,omitempty"`
+	Text        string `json:"text"`
+	ReplyMarkup struct {
+		InlineKeyboard [][]button `json:"inline_keyboard"`
+	} `json:"reply_markup"`
+}
+
+func makeButton(e Entry) button {
+	b := button{Text: e.Text, CallbackData: e.Text}
+	if e.Checked {
+		b.Text = fmt.Sprintf("✓ %s", e.Text)
+	}
+	return b
+}
+
+func makeButtons(items []Entry) [][]button {
+	var buttons [][]button
+	var current []button
+	for _, item := range items {
+		current = append(current, makeButton(item))
+		if len(current) == 2 {
+			buttons = append(buttons, current)
+			current = []button{}
+		}
+	}
+	if len(current) != 0 {
+		buttons = append(buttons, current)
+	}
+	return buttons
+}
+
+func (g *GList) GenSendListReq() ([]byte, error) {
+	req := newListReq{ChatID: g.ChatID, MessageID: g.MessageID, Text: "ok"}
+	itemButtons := makeButtons(g.Items)
+	controlButtons := []button{{"clear checked", "clear"}}
+	req.ReplyMarkup.InlineKeyboard = append(itemButtons, controlButtons)
+	data, err := json.Marshal(req)
+	return data, err
+}
diff --git a/glist/glist_test.go b/glist/glist_test.go
new file mode 100644
index 0000000..9ae4691
--- /dev/null
+++ b/glist/glist_test.go
@@ -0,0 +1,20 @@
+package glist
+
+import (
+	"sync"
+	"testing"
+)
+
+func TestGList(t *testing.T) {
+	var ti int
+	var m sync.Mutex
+	g := GList{ti, m, 4342, nil, []Entry{{"foo", true}}}
+	data, err := g.GenSendListReq()
+	if err != nil {
+		t.Fatal(err)
+	}
+	expected := `{"chat_id":4342,"text":"ok","reply_markup":{"inline_keyboard":[[{"text":"✓ foo","callback_data":"foo"}]]}}`
+	if expected != string(data) {
+		t.Fatalf("expected: %s\n got:%s\n", expected, string(data))
+	}
+}
diff --git a/main.go b/main.go
index 1942e82..3105089 100644
--- a/main.go
+++ b/main.go
@@ -1,21 +1,23 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"fmt"
 	"io"
 	"log"
 	"net/http"
-	"strings"
+	"sync"
+	"time"
+
+	"gitea.balki.me/telegram-msgchkbox/glist"
 )
 
 var apiToken = "421791796:AAE4wPbcqfLP1GNeGR3RTBiyX16fCj3HPAM"
 
 func main() {
+	var chats sync.Map
 	fmt.Println("vim-go")
-	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-		w.WriteHeader(http.StatusNotFound)
-	})
 	http.HandleFunc("/zeexkfcsdjpmncirkyelwzotjmmefcqtcogrfwnafidionxiacwnslwuhbwfuppjgwzbmazd", func(w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte("ok"))
 		body, err := io.ReadAll(r.Body)
@@ -50,39 +52,70 @@ func main() {
 		}
 
 		if update.Message != nil {
-			go sendButton(update.Message.Chat.ID, update.Message.ID, update.Message.Text)
-			go DeleteMessage(update.Message.Chat.ID, update.Message.ID)
+
+			chatID := update.Message.Chat.ID
+			g, _ := chats.LoadOrStore(chatID, glist.NewGList(chatID))
+			gl := g.(*glist.GList)
+			go handleTextAdded(gl, update.Message.Text)
 		} else if update.CallbackQuery != nil {
-			go markButtonChecked(update.CallbackQuery.Message.Chat.ID, update.CallbackQuery.Message.ID, update.CallbackQuery.Data)
-			go answerCallbackQuery(update.CallbackQuery.ID)
+			defer func() { go answerCallbackQuery(update.CallbackQuery.ID) }()
+
+			chatID := update.CallbackQuery.Message.Chat.ID
+			g, ok := chats.Load(chatID)
+			if !ok {
+				log.Println("Chat not found: %s", chatID)
+				return
+			}
+			gl := g.(*glist.GList)
+			go handleButtonClick(gl, update.CallbackQuery.Message.ID, update.CallbackQuery.Data)
+
 		}
 	})
 	port := 28923
 	log.Panic(http.ListenAndServe(fmt.Sprintf(":%v", port), nil))
 }
 
-func markButtonChecked(chatID int, messageID int, text string) {
-	url := fmt.Sprintf("https://api.telegram.org/bot%s/editMessageText", apiToken)
-	text = fmt.Sprintf("✓ %s", text)
-	sendMsgFmt := `
-				{
-				  "chat_id": "%d",
-				  "message_id": "%d",
-				  "text": "ok",
-				  "reply_markup": {
-					"inline_keyboard": [
-					  [
-						{
-						  "text": "%s",
-						  "callback_data": "%s"
-						}
-					  ]
-					]
-				  }
-				}
-			`
-	sendMsgReq := fmt.Sprintf(sendMsgFmt, chatID, messageID, text, text)
-	resp, err := http.Post(url, "application/json", strings.NewReader(sendMsgReq))
+func handleTextAdded(gl *glist.GList, text string) {
+	gl.Mutex.Lock()
+	defer gl.Mutex.Unlock()
+	gl.Add(text)
+	count := gl.AllMsgCounter + 1
+	gl.AllMsgCounter = count
+	time.AfterFunc(30*time.Second, func() {
+		gl.Mutex.Lock()
+		defer gl.Mutex.Unlock()
+		if count == gl.AllMsgCounter {
+			sendList(gl, "sendMessage")
+		}
+	})
+}
+
+func handleButtonClick(gl *glist.GList, messageID int, text string) {
+	gl.Mutex.Lock()
+	defer gl.Mutex.Unlock()
+	if gl.MessageID != nil {
+		if messageID != *gl.MessageID {
+			go deleteMessage(gl.ChatID, *gl.MessageID)
+		}
+	}
+	gl.MessageID = &messageID
+	if text == "clear" {
+		gl.ClearChecked()
+	} else {
+		gl.Toggle(text)
+	}
+
+	sendList(gl, "editMessageText")
+}
+
+func sendList(gl *glist.GList, method string) {
+	url := fmt.Sprintf("https://api.telegram.org/bot%s/%s", apiToken, method)
+	sendMsgReq, err := gl.GenSendListReq()
+	if err != nil {
+		log.Println(err)
+		return
+	}
+	resp, err := http.Post(url, "application/json", bytes.NewReader(sendMsgReq))
 	if err != nil {
 		log.Println(err)
 		return
@@ -100,33 +133,7 @@ func answerCallbackQuery(callbackQueryID string) {
 	logBody(resp.Body)
 }
 
-func sendButton(chatID int, messageID int, text string) {
-	url := fmt.Sprintf("https://api.telegram.org/bot%s/sendMessage", apiToken)
-	sendMsgFmt := `
-			{
-			  "chat_id": "%d",
-			  "text": "ok",
-			  "reply_markup": {
-				"inline_keyboard": [
-				  [
-					{
-					  "text": "%s",
-					  "callback_data": "%s"
-					}
-				  ]
-				]
-			  }
-			}
-			`
-	sendMsgReq := fmt.Sprintf(sendMsgFmt, chatID, text, text)
-	resp, err := http.Post(url, "application/json", strings.NewReader(sendMsgReq))
-	if err != nil {
-		log.Println(err)
-		return
-	}
-	logBody(resp.Body)
-}
-func DeleteMessage(chatID int, messageID int) {
+func deleteMessage(chatID int, messageID int) {
 	deleteUrl := fmt.Sprintf("https://api.telegram.org/bot%s/deleteMessage?chat_id=%d&message_id=%d", apiToken, chatID, messageID)
 	resp, err := http.Get(deleteUrl)
 	if err != nil {
@@ -151,7 +158,7 @@ func logBody(respBody io.ReadCloser) {
 	log.Println(string(body))
 }
 
-/*
+/* Example data
 update_id: 547400623
 message:
   message_id: 869