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| English | Bulgarian |
| first boot | първоначално стартиране (A phase of Windows Setup that starts the first time an end user boots Windows) |
| First Expiry First Out | Изписване от склад по срок на годност (A method used for determining the order in which goods should be taken out of inventory, so that items with the earliest expiration dates are taken first) |
| first in | първи излязъл |
| first in | първи влязъл |
| First Name | собствено име (In the Add a Contact Wizard, one of the fields by which you can search for a contact) |
| first name | собствено име (The given name for an individual) |
| first out | първи влязъл (A method for processing a queue in which items in the queue are removed in the same order in which they were added) |
| first out | първи излязъл (A method for processing a queue in which items in the queue are removed in the same order in which they were added) |
| first-run experience | представяне при първо изпълнение (The experience that is presented to end users the first time they start a new computer) |