special_tokens_map.json

{
    "unk_token": "[UNK]",
    "sep_token": "[SEP]",
    "pad_token": "[PAD]",
    "cls_token": "[CLS]",
    "mask_token": "[MASK]",
    "additional_special_tokens": [
        "[BOF]",
        "[EOF]"
    ]
}