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We beseech God, the Most High, to accept our humble efforts and to enable us to enhance them under the auspices of Imām al-Mahdī, His vicegerent on the earth (may Allah expedite his advent).

We express our gratitude to Alī Rezā Aminī and Mohsen Javadi, the authors of the present book, and Dr. Mansoor Limba, its translator. We also thank our colleagues who have participated in producing this work, especially the staff of the Translation Office.