text: var colors = ["white","red","blue"];
  var emoji = {
  	numbers: {
  		0:":zero:",
  		1:":one:",
  		2:":two:",
  		3:":three:",
  		4:":four:",
  		5:":five:",
  		6:":six:",
  		7:":seven:",
  		8:":eight:",
  		9:":nine:"
  	},
  	circles : {
  		white : ":white_circle:",
  		red : ":red_circle:",
  		blue : ":large_blue_circle:"
  	}
  }
  var lastPlayer = "";
  module.exports.lastPlayer = lastPlayer;
  var players = [];
  module.exports.players = players;
  
  
  var boardSize = 7; // 7 - 1 ...
  var board = [];
  for (var i = 0; i < boardSize-1; i++) {
  	board[i] = [];
  }
  
  var initBoard = function(){
  	players.length = 0;
  	for (var i = 0; i < boardSize-1; i++) {
  		for(var j = 0; j <= 6; j++){
  			board[i][j] = emoji.circles.white;
  		}
  	}
  };
  module.exports.initBoard = initBoard;
  
  
  var drawBoard = function(){
  	console.log("board : ", board);
  	var msg = "";
  	// draw number line
  	for (var i = 1; i <= boardSize; i++) {
  		msg += emoji.numbers[i];
  	}
  	msg+="\n";
  	// draw circle
  	for (var i = 0; i < boardSize-1; i++) {
  		for(var j = 0; j <= 6; j++){
  			console.log(i,j, board[i][j]);
  			msg += board[i][j];
  			// msg += "["+i+","+j+"]";
  		}
  		msg += "\n";
  	}
  	/*
  	[0,0][0,1][0,2][0,3][0,4][0,5][0,6]
  	[1,0][1,1][1,2][1,3][1,4][1,5][1,6]
  	[2,0][2,1][2,2][2,3][2,4][2,5][2,6]
  	[3,0][3,1][3,2][3,3][3,4][3,5][3,6]
  	[4,0][4,1][4,2][4,3][4,4][4,5][4,6]
  	[5,0][5,1][5,2][5,3][5,4][5,5][5,6]
  	*/
  
  	return msg;
  }
  module.exports.drawBoard = drawBoard;
  
  
  var pushToCol = function(x, color){
  	console.log("push to col : ", x);
  	var i = 5;
  	while(board[i][x-1] != emoji.circles.white ){
  		i--;
  	}
  
  	if(i >= 0 ){
  		board[i][x-1] = emoji.circles[color];
  	}else{
  		return false;	
  	}
  	return true;
  }
  module.exports.pushToCol = pushToCol;
  
  var selectColor = function(name){
  	var player = {"name":name, "color" : colors[players.length+1], "emoji": emoji.circles[ colors[players.length+1] ]}
  	players.push(player);
  	return player;
  }
  module.exports.selectColor = selectColor;