What does Exodus 8:17 mean?

And they did so; and Aaron stretched out his hand with his rod, and smote the dust of the earth, and there were lice upon man, and upon beast; all the dust of the earth became lice throughout all the land of Egypt.

And they did so; for Aaron stretched out his hand with his rod, and smote the dust of the earth, and it became lice in man, and in beast; all the dust of the land became lice throughout all the land of Egypt.

And they did so; and Aaron stretched out his hand with his rod, and smote the dust of the earth, and there were lice upon man, and upon beast; all the dust of the earth became lice throughout all the land of Egypt.

And they did so; and Aaron, stretching out the rod in his hand, gave a touch to the dust of the earth, and insects came on man and on beast; all the dust of the earth was changed into insects through all the land of Egypt.

And they do so, and Aaron stretcheth out his hand with his rod, and smiteth the dust of the land, and the gnats are on man and on beast; all the dust of the land hath been gnats in all the land of Egypt.

And they did so. And Aaron stretched forth his hand, holding the rod; and he struck the dust of the earth, and there came sciniphs on men and on beasts: all the dust of the earth was turned into sciniphs through all the land of Egypt.

And they did so; and Aaron stretched out his hand with his staff, and smote the dust of the earth, and there arose gnats on man and on beast: all the dust of the land became gnats throughout the land of Egypt.