What does Leviticus 25:8 mean?

And thou shalt number seven sabbaths of years unto thee, seven times seven years; and there shall be unto thee the days of seven sabbaths of years, even forty and nine years.

And thou shalt number seven sabbaths of years unto thee, seven times seven years; and the space of the seven sabbaths of years shall be unto thee forty and nine years.

And thou shalt number seven sabbaths of years unto thee, seven times seven years; and there shall be unto thee the days of seven sabbaths of years, even forty and nine years.

And let seven Sabbaths of years be numbered to you, seven times seven years; even the days of seven Sabbaths of years, that is forty-nine years;

`And thou hast numbered to thee seven sabbaths of years, seven years seven times, and the days of the seven sabbaths of years have been to thee nine and forty years,

Thou shalt also number to thee seven weeks of years: that is to say, seven times seven, which together make forty-nine years.

And thou shalt count seven sabbaths of years, seven times seven years; so that the days of the seven sabbaths of years be unto thee forty-nine years.