Help me understand

GRE Quant Problem Solving
1

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sorry for the bad picture quality
My question is i am quiet lost into Words over here how do we know these persons are the same the one who takes no Salt and on relish and the one who takes no peper and no relish

2

https://gmatclub.com/forum/of-three-persons-two-take-relish-two-take-pepper-and-two-take-salt-294397.html