added_tokens.json

{
  "</s_Letter.Date>": 57527,
  "</s_Letter.Number>": 57525,
  "<s_Letter.Date>": 57528,
  "<s_Letter.Number>": 57526,
  "<s_dataset_letter_date_number>": 57529,
  "<s_iitcdip>": 57523,
  "<s_synthdog>": 57524,
  "<sep/>": 57522
}