code: func MustFinalTransactionTrytes(txs Transactions) []Trytes {
  	trytes := MustTransactionsToTrytes(txs)
  	for i, j := 0, len(trytes)-1; i < j; i, j = i+1, j-1 {
  		trytes[i], trytes[j] = trytes[j], trytes[i]
  	}
  	return trytes
  }
docs: // MustFinalTransactionTrytes returns a slice of transaction trytes from the given transactions.
  // The order of the transactions is reversed in the output slice.