Kushans were most probably one of the five branches of the Yuezhi confederation. Kujula Kadphises was the first Yuezhi chief and he laid the foundation of the Kushana Empire in India. He established his supremacy over Kabul, Kandahar, and Afghanistan.
Viharas were for the purpose of living, Chaityas were assemblies for the purpose of discussions. Further, Chaityas were with Stupas, Viharas did not have stupas.
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