code: func (pool *TxPool) Content() (map[common.Address]types.Transactions, map[common.Address]types.Transactions) {
  	pool.mu.Lock()
  	defer pool.mu.Unlock()
  
  	pending := make(map[common.Address]types.Transactions)
  	for addr, list := range pool.pending {
  		pending[addr] = list.Flatten()
  	}
  	queued := make(map[common.Address]types.Transactions)
  	for addr, list := range pool.queue {
  		queued[addr] = list.Flatten()
  	}
  	return pending, queued
  }
docs: // Content retrieves the data content of the transaction pool, returning all the
  // pending as well as queued transactions, grouped by account and sorted by nonce.