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Sometimes it is hard to tell Sonja and Melanie a part. First, they look alike, since each has shiny black hair and big brown eyes. They also have the same hobbies. Sonja does like to go fishing without Melanie sometimes. They have similar families, too.
The main idea of this text is
What is Sonja and Melanie have lots of similarities?
or
What is Sonja and Melanie have lots of things in common?