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| Subject | English | Croatian |
| comp., MS | four character code | kod od četiri znaka (A 32-bit unsigned integer that is created by concatenating four ASCII characters to identify a data format) |
| mech.eng. | four stroke cycle | četverotaktni radni ciklus |
| environ. | four stroke engine | četverotaktni motor |
| econ. | Group of Twenty-Four | Grupa 24 |