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| be irreplaceable (for ... – для ... // CNN, 2015 Alex_Odeychuk); be worth one's weight of in gold | |||
| be pure gold (Tests are pure gold for medium- and large-scale software projects, more important than the code itself. Alex_Odeychuk) | |||
| be worth one's weight in gold; be worth one's weight of gold | |||
| быть незаменимым: 5 phrases in 2 subjects |
| Idiomatic | 3 |
| Makarov | 2 |