If all the livestock died during Plague #5, what animals had boils in Plague #6? It seems as if there is a difference made between livestock and animals. Perhaps the animals with the boils were household animals or other animals not considered livestock.

It is after the plague of boils that it is God who hardens Pharaoh's heart.

During the plague of hail, again livestock is mentioned. Some time must have passed since Plague #5 for them to have livestock. They could have acquired more animals from outside the city of Egypt and from the land of Egypt. (Egypt is the city. The land of Egypt is the surrounding fields and country.)

In the plague of darkness, it says that the darkness can be felt. What kind of darkness can be felt? Praise God, that Jesus is our Light!