Is it necessary to perform tayammum twice for major ritual impurity (janabah) and minor ritual impurity (wudu'), and is one tayammum sufficient for someone who is obligated to perform it after the prayer, and what is the ruling on intentionally delaying the prostration of forgetfulness after the prayer?

Whoever is in a state of janabah and is unable to use water, he should resort to tayammum, and one tayammum is sufficient for him. However, he must intend the major impurity if he intends to make prayer permissible, or to make permissible what the impurity prevented. But if he intends the obligation of tayammum, it is sufficient for him.