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://mechanic.farafile.ir/file/44763/طرح-درس-و-روش-تدریس-ریاضی-سوم-فصل1-ماشین-های-ورودی-خروجی