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ताभ्यां रूपविभागाभ्यां मिथुनं समपद्यत ॥ ५३ ॥

tabhyam rupa-vibhagabhyam

mithunam samapadyata

tabhyam-of them; rupa-form; vibhagabhyam-thus being divided; mithunam-sex relation; samapadyata-perfectly executed.