user
Instruction
This is a table fact verification task. The goal of this task is to distinguish whether the given statement is entailed or refuted by the given table.


Table
Table Title: françoise dürr
Table Content:
| outcome | year | championship | surface | partner | opponents in the final | score in the final |
| --- | --- | --- | --- | --- | --- | --- |
| winner | 1968 | french open | clay | jean - claude barclay | billie jean king owen davidson | 6 - 1 , 6 - 4 |
| runner - up | 1969 | french open | clay | jean - claude barclay | margaret court marty riessen | 6 - 3 , 6 - 2 |
| runner - up | 1969 | us open | grass | dennis ralston | margaret court marty riessen | 6 - 4 , 7 - 5 |
| runner - up | 1970 | french open | clay | jean - claude barclay | billie jean king bob hewitt | 3 - 6 , 6 - 4 , 6 - 2 |
| winner | 1971 | french open | clay | jean - claude barclay | winnie shaw thomas lejus | 6 - 2 , 6 - 4 |
| runner - up | 1972 | french open | clay | jean - claude barclay | evonne goolagong cawley kim warwick | 6 - 2 , 6 - 4 |
| winner | 1973 | french open | clay | jean - claude barclay | betty stöve patrice dominguez | 6 - 1 , 6 - 4 |


Statement
before the year of 1971 the court surface be clay


Answer Format
The final answer should be either "entailed" or "refuted" and use the following format:
```json
{
    "answer": "entailed" or "refuted"
}
```
rule
["refuted"]