5. The Obligatory Prayers should be offered individually. 6. The choice of one of the three Obligatory Prayers is permissible. 7. By "morning", "noon" and "evening", mentioned in connection with the Obligatory Prayers, is meant respectively the intervals between sunrise and noon, between noon and sunset, and from sunset till two hours after sunset. 8. The recital of the first (long) Obligatory Prayer, once in twenty-four hours is sufficient. 9. It is preferable to offer the third (short) Obligatory Prayer while standing. 10. Ablutions: a. Ablutions must precede the recital of the Obligatory Prayers. b. For every Obligatory Prayer fresh ablutions must be performed. c. Should two Obligatory Prayers be offered at noon one ablution for both prayers is sufficient. d. If water is unavailable or its use harmful to the face or hands, the repetition, five times, of a specifically revealed verse is prescribed. e. Should the weather be too cold the use of warm water is recommended. f. If ablutions have been performed for other purposes, their renewal prior to the recital of the Obligatory Prayer is not required. g. Ablutions are essential whether a bath has been taken previously or not. 11. Determining the times fixed for Prayer: a. Reliance on clocks is permissible in determining the times for offering the Obligatory Prayers. b. In countries situated in the extreme north or south, where the duration of days and nights varies considerably, clocks and timepieces should be relied upon, without reference to sunrise or sunset.