What does Deuteronomy 19:9 mean?

if thou shalt keep all this commandment to do it, which I command thee this day, to love Jehovah thy God, and to walk ever in his ways; then shalt thou add three cities more for thee, besides these three:

If thou shalt keep all these commandments to do them, which I command thee this day, to love the Lord thy God, and to walk ever in his ways; then shalt thou add three cities more for thee, beside these three:

if thou shalt keep all this commandment to do it, which I command thee this day, to love Jehovah thy God, and to walk ever in his ways; then shalt thou add three cities more for thee, besides these three:

If you keep and do all these orders which I give you today, loving the Lord your God and walking ever in his ways; then let three more towns, in addition to these three, be marked out for you:

when thou keepest all this command to do it, which I am commanding thee to-day, to love Jehovah thy God, and to walk in His ways all the days--then thou hast added to thee yet three cities to these three;

(Yet so, if thou keep his commandments, and do the things which I command thee this day, that thou love the Lord thy God, and walk in his ways at all times) thou shalt add to thee other three cities, and shalt double the number of the three cities aforesaid:

(if thou keep all this commandment to do it, which I command thee this day, to love Jehovah thyGod, and to walk in his ways continually), then shalt thou add three cities more for thyself to these three,