It is possible because there is no rule to prevent it.
In some situations it is useful. To make an analogy, I need to buy some food for the week. I need a new pair of shoes. I need to get paper for my printer. I could go to the shops, buy food, come home, put it away, then go out to the shops buy a pair of shoes, come home and put them away, then go out and buy some paper, come home and put it away. Or I could go to the shops, buy some food, then buy a pair of shoes, then buy some paper, and then come home and put it all away. By combining these three unrelated things into one trip to the shops, I save time.
In some situations it is not useful. Suppose I need to buy a new pair of shoes, and a family member wants a new iPhone. I can afford the shoes, but I can’t afford the new iPhone. The family member says, “you can’t go to the shops unless you come back with the iPhone”. So unless disobey them, I’m not getting new shoes.
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