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| once-in-a-lifetime (возможность; idiom Val_Ships) | |||
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| exceedingly rare (Although some detectives are also registered CSIs, this is exceedingly rare in actual life. 4uzhoj) | |||
| extremely rare (о книге); impossible to find (о книге) | |||
| крайне редкая: 3 phrases in 3 subjects |
| Figurative | 1 |
| Informal | 1 |
| Production | 1 |