End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
http://paper.farafile.ir/file/44832/طرح-درس-و-روش-تدریس-ریاضی-اول-تم-5-جمع-و-تفریق-با-چوب-خط