```python
mapping = {
    "eruptor usb": "unknown",
    "eruptors": "unknown",
    "eruptors hubs": "unknown",
    "escrowed pre-order miners": "unknown",
    "esd bag": "unknown",
    "esd-bags": "unknown",
    "espresso coffee machines": "unknown",
    "etched boards": "unknown",
    "eternal 1350": "unknown",
    "eternet connectors": "unknown",
    "eth net wire": "unknown",
    "eth rig": "unknown",
    "eth rigs": "unknown",
    "eth0": "unknown",
    "ethernet": "unknown",
    "ethernet adapter": "unknown",
    "ethernet adapters": "unknown",
    "ethernet cable": "unknown",
    "ethernet cables": "unknown",
    "ethernet controler": "unknown",
    "ethernet controller": "unknown",
    "ethernet hub": "unknown",
    "ethernet interface": "unknown",
    "ethernet light": "unknown",
    "ethernet plugs": "unknown",
    "ethernet port": "unknown",
    "ethernet port lights": "unknown",
    "ethernet ports": "unknown",
    "ethernet power controller ii": "unknown",
    "ethernet socket": "unknown",
    "ethernet splitter": "unknown",
    "ethernet switch": "unknown",
    "eu plug": "unknown",
    "europe compac model": "unknown",
    "europuters": "unknown",
    "evga": "unknown",  # EVGA is a brand that manufactures various computer hardware, including PSUs, but no specific model is mentioned.
    "evga 1000 supernova g1": "unknown",  # While EVGA manufactures PSUs, none in the provided list specifically match this model.
    "evga 1000 watt plat": "unknown",
    "evga 1000w supernova g1": "unknown",
    "evga 1000w/1300w": "unknown",
    "evga 120-g2-1300-xr 80 plus gold 1300 w": "unknown",
    "evga 1200 p2": "unknown",
    "evga 1200 w platinum": "unknown",
    "evga 1300": "unknown",
    "evga 1300 cables": "unknown",
    "evga 1300 cord": "unknown",
    "evga 1300 g2": "unknown",
    "evga 1300 g2 atx-psu": "unknown",
    "evga 1300 g2 psu": "unknown",
    "evga 1300 g2 psu's": "unknown",
}
```