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পর্যায়ন প্রক্রিয়ার মাধ্যমে ভূপৃষ্ঠের উঁচু ও নীচু ভূভাগ একটি সাধারণ তল বা পৃষ্ঠে উপনীত হয়।
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পর্যায়ন প্রক্রিয়ার মাধ্যমে ভূপৃষ্ঠের উঁচু ও নীচু ভূভাগ একটি সাধারণ তল বা পৃষ্ঠে উপনীত হয়।