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://alborz.farafile.ir/file/24480/پاورپوینت-مباحث-نوین-تحقیق-در-عملیات-فرآیند-تحلیل-سلسله-مراتبی