I have a table like below.
Table name is 'Test'.

```
+----+----------+----------+
| id | word     | topic    |
+----+----------+----------+
|  1 | plus     | math     |
|  2 | minus    | math     |
|  3 | multiple | math     |
|  4 | minus    | math     |
|  5 | cpu      | computer |
|  6 | click    | computer |
|  7 | monitor  | computer |
|  8 | cpu      | computer |
|  9 | multiple | computer |
+----+----------+----------+

```

How can I find duplicate word with same topic?

I want result like below.

```
 +----+----------+----------+
 | id | word     | topic    |
 +----+----------+----------+
 |  2 | minus    | math     |
 |  4 | minus    | math     |
 |  5 | cpu      | computer |
 |  8 | cpu      | computer |
 +----+----------+----------+

```