The sentences given below, when properly sequenced, form a coherent paragraph.
Each sentence is labelled with a number. Decide on the most logical order and enter the sequence of numbers in the space provided. Only numbers are to be entered in the space provided for the answer, and no letters, characters, or spaces should be entered. For example, a response such as 3412 is valid, and responses such as 3412. or 3 41 2 are invalid.

1. What is more shocking to observe is how often such strokes lead to death.
2. When the body temperature rises, our vital organs swell, and this causes death.
3. One main reason for this is that people underestimate how badly heat can affect the body.
4. Heat strokes have become more common in our country than ever before.