LVIV, Ukraine (AP) — The Soviet-era apartment blocks at the end of a tram line in this western Ukrainian city show an indifferent face to the world, blank and gray. But behind every lighted window is a story, never so much as now. Lviv on the surface looks calm, too. But the city is uniquely representative of the 10 million people displaced inside Ukraine since Russia’s invasion, absorbing at least 500,000 new residents. The Associated Press visited one apartment building that holds families from some of Ukraine’s most devastated communities. The families don’t know each other, but they can recognize displaced people like themselves on sight, without exchanging a word.