user
Instruction
Answer the question based on the provided table.


Table
Table Title: ces-8 and ces-30 descriptive information
Table Content:
<table border="1" cellspacing="0">
<tr> <td> items </td> <td> proportion of respondents experiencing the item at least once </td> </tr>
<tr> <td> 1. receiving incoming artillery, rocket, or mortar fire </td> <td> 63.0 </td> </tr>
<tr> <td> 2. improvised explosive device (ied)/booby-trap exploded near you </td> <td> 60.1 </td> </tr>
<tr> <td> 3. having hostile reactions from civilians </td> <td> 57.6 </td> </tr>
<tr> <td> 4. seeing dead bodies or human remains </td> <td> 45.6 </td> </tr>
<tr> <td> 5. being attacked or ambushed </td> <td> 42.4 </td> </tr>
<tr> <td> 6. receiving small arms fire </td> <td> 42.0 </td> </tr>
<tr> <td> 7. having a member of your own unit become a casualty </td> <td> 38.9 </td> </tr>
<tr> <td> 8. working in areas that were mined or had ieds </td> <td> 38.8 </td> </tr>
<tr> <td> 9. witnessing an accident which resulted in serious injury or death </td> <td> 37.5 </td> </tr>
<tr> <td> 10. knowing someone seriously injured or killed </td> <td> 34.8 </td> </tr>
<tr> <td> 11. seeing dead or seriously injured canadians </td> <td> 34.1 </td> </tr>
<tr> <td> 12. clearing/searching homes or buildings </td> <td> 28.9 </td> </tr>
<tr> <td> 13. participating in ied/mine clearing </td> <td> 28.6 </td> </tr>
<tr> <td> 14. shooting or directing fire at the enemy </td> <td> 28.2 </td> </tr>
<tr> <td> 15. seeing ill/injured women or children who you were unable to help </td> <td> 24.2 </td> </tr>
<tr> <td> 16. having difficulty distinguishing between combatants and non-combatants </td> <td> 21.2 </td> </tr>
<tr> <td> 17. handling or uncovering human remains </td> <td> 19.8 </td> </tr>
<tr> <td> 18. being in threatening situations where you were unable to respond because of rules of engagement </td> <td> 19.7 </td> </tr>
<tr> <td> 19. calling fire on the enemy </td> <td> 13.6 </td> </tr>
<tr> <td> 20. seeing a unit member blown up or burned alive </td> <td> 11.9 </td> </tr>
<tr> <td> 21. clearing/searching caves or bunkers </td> <td> 11.4 </td> </tr>
<tr> <td> 22. had a buddy shot or hit who was near you </td> <td> 10.5 </td> </tr>
<tr> <td> 23. had a close call, was shot or hit but protective gear saved you </td> <td> 10.3 </td> </tr>
<tr> <td> 24. feeling directly responsible for the death of an enemy combatant </td> <td> 10.3 </td> </tr>
<tr> <td> 25. being wounded/injured </td> <td> 7.7 </td> </tr>
<tr> <td> 26. witnessing a friendly fire incident </td> <td> 7.4 </td> </tr>
<tr> <td> 27. sniper fire </td> <td> 7.0 </td> </tr>
<tr> <td> 28. feeling responsible for the death of canadian or ally personnel </td> <td> 2.6 </td> </tr>
<tr> <td> 29. feeling directly responsible for the death of a non-combatant </td> <td> 1.9 </td> </tr>
<tr> <td> 30. engaging in hand-to-hand combat </td> <td> 1.0 </td> </tr>
</table>


Question
which event was the most commonly experienced ?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["1. receiving incoming artillery, rocket, or mortar fire"]