Trenching on three sides all round a marked area into the rock outcrop isolated a large rectangular mass on which the scarps for the excavation were prepared . चट्टानी दृश्यांश के एक निर्धारित क्षेत्र निर्धारित क्षेत्र के आसपास तीन दिशाओं में खंदक खेदकर एक आयताकार पुंज प्Qथक कर दिया गया जिस पर उत्खनन के लिए कगार बनाए गए .
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