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firm (Ivan Pisarev); well-researched (об ответе: If you will permit me, we will make sure we give you a firm, well-researched answer, and I will get that as soon as possible.  google.com) | |||
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| have done homework on (к чему-либо); do one's homework (tats) | |||
| основательно подготовленный: 1 phrase in 1 subject |
| Makarov | 1 |