1. This first version is called unofficially '' rare version '' .
2. This rare version is called '' first version '' unofficially .
OPTIONS:
- no
- yes

no

1. Central forces that are conservative can always be expressed as the potential gradient of a negative energy .
2. The conservative central forces can always be expressed as a negative gradient of a potential energy :
OPTIONS:
- no
- yes

no

1. '' Legend '' was released on DVD and Blu-ray on January 25 , 2016 in the USA and on March 1 , 2016 in the United Kingdom .
2. '' Legend '' was released on DVD and Blu-ray on January 25 , 2016 in the United Kingdom and on 1 March 2016 in the USA .
OPTIONS:
- no
- yes
no