Input (grade 13): Rashidun, 632-661 Abu Bakr, the first successor of Muhammad, according to Sunni beliefs, nominated Umar as his successor on his deathbed, and there was consensus in the Muslim community to his choice.
Output (grade 12): Abu Bakr, the first successor of Muhammad, nominated Umar as his successor on his deathbed, and there was consensus in the Muslim community to his choice.