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Whatever nullifies ablution and/or bathing.
Presence of water for the one who couldn’t find water.
Ability to use water for one who previously was incapable of using it.
Expiration of the permitted reason for making tayammum.
If one prayed using dry ablution and found water while the time for prayer was still valid, he’s not required to repeat the prayer. (Opinion of Maliki and Shafa’i)