A salted fishapos;s

Old Yan chuckled and said, "I brought some too, but I don't want to give them out today. Let's talk about it tomorrow.",He was going to the quarry to see if they also used copper coins for transactions. If so, he would take his silver and exchange it for copper coins first, then use the copper coins to pay, making a profit on the difference.,Which one is longest, that's the one to choose first.。