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আয়তলেখের অনুভূমিক অক্ষে শ্রেণি ব্যবধান বা শ্রেণি প্রসার প্রকাশ করা হয়।
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আয়তলেখের অনুভূমিক অক্ষে শ্রেণি ব্যবধান বা শ্রেণি প্রসার প্রকাশ করা হয়।