Does the phrase "at least in part" cover "exact match" too?

Question

wherein string A at least in part match with string B

Is the phrase "at least in part" here valid when both string A and String B has the exact same value?

Also is that phrase bi-directional?

Answer 1

You might get an idea about this from an analogous case involving "a portion" of the backing of a baby changing table. It was ruled that "a portion" did not include "the whole" and the alleged infringer won. Now we write "at least a portion" in our claims.