When the Berlin Wall fell in early November, 1989 Berlin's east and west sections were rejoined to create the third-largest city in Europe , with a population of about 3 million.
East Berlin did not exist after the wall fell
Once the wall fell east and west BErlin were no more.  There was just Berlin
( z1 exist :polarity - :ARG1 ( z2 city :name ( z3 name :op "East" :op "Berlin" ) ) :time ( z4 after :op ( z5 fall :ARG1 ( z6 wall ) ) ) )