code: func deleteBlockWithoutNumber(db ethdb.Writer, hash common.Hash, number uint64) {
  	DeleteReceipts(db, hash, number)
  	deleteHeaderWithoutNumber(db, hash, number)
  	DeleteBody(db, hash, number)
  	DeleteTd(db, hash, number)
  }
docs: // deleteBlockWithoutNumber removes all block data associated with a hash, except
  // the hash to number mapping.