user
Instruction
Answer the question based on the provided table.


Table
Table Title: 'Fleet' regarding 'Trolleybuses in Sydney'
Table Content:
| Image | Fleet numbers | Quantity | Chassis | Body | Configuration | In service |
| --- | --- | --- | --- | --- | --- | --- |
| - | 1 | 1 | AEC 663T | Park Royal | Three axle, single deck | 1934-1956 |
| - | 2–3 | 2 | AEC 663T | H McKenzie | Three axle, single deck | 1934-1956 |
| - | 3 | 1 | AEC 761T | Park Royal | Two axle, double deck | 1934-1948 |
| - | 4-5 | 2 | AEC 761T | Syd Wood | Two axle, double deck | 1936/37-1956 |
| - | 6-16 | 11 | Leyland TTB4 | Ritchie Brothers | Three axle, double deck | 1937-1959 |
| - | 17-26 | 10 | AEC 664T | Ritchie Brothers | Three axle, double deck | 1937-1959 |


Question
What three-axle double deck buses are in Sydney?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["11 Leyland TTB4 and 10 AEC 664T double deck three-axle buses are trolleybuses in Sydney that were bodied by Ritchie Brothers."]