However, if we add another word such as "Portugal" forming "in Portugal", it is more likely that "in" is translated to "em".
we define the joint event of "in" translating to "em" (A 1 ) and "Portugal" to "Portugal" (B 1 ), denoted as A 1 ∩ B 1 , in the phrase pair p(in P ortugal, em P ortugal).