What does Numbers 1:28 mean?

Of the children of Issachar, their generations, by their families, by their fathers’ houses, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;

Of the children of Issachar, by their generations, after their families, by the house of their fathers, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;

Of the children of Issachar, their generations, by their families, by their fathers’ houses, according to the number of the names, from twenty years old and upward, all that were able to go forth to war;

The generations of the sons of Issachar were numbered by their families and their fathers' houses, every male of twenty years old and over who was able to go to war;

Of the sons of Issachar--their births, by their families, by the house of their fathers, in the number of names, from a son of twenty years and upward, every one going out to the host--

Of the sons of Issachar, by their generations and families and houses of their kindreds, by the names of every one from twenty years old and upward, all that could go forth to war,

Of the sons of Issachar: their generations, after their families, according to their fathers' houses, by the number of the names, from twenty years old and upward, all that went forth to military service: