What is the term for the inability of a child to mentally "undo" something

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Irreversibility refers to the cognitive limitation in which a child cannot mentally undo an action or operation, making it seem irreversible to them. For example, a child might think that cutting a sandwich in half and putting it back together makes it a bigger sandwich when, in reality, the amount of bread and filling stays the same. This inability to reverse mental operations is a characteristic of preoperational thought in Piaget's theory of cognitive development.

What Is the Term for the Inability of a Child