Cooking an egg, Reversible, Irreversible, Melting chocolate, Reversible, Irreversible, Melting butter, Reversible, Irreversible, Melting toffee, Reversible, Irreversible, Baking a potato, Reversible, Irreversible, Melting Icelolly, Reversible, Irreversible, Melting ice - cream, Reversible, Irreversible, Burning wood, Reversible, Irreversible

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