TEHRAN As United Nations sanctions returned in full force on Sept. 28, Iranians felt the strain deepen, with prices soaring and the rial sinking to new lows. For Helia, a 33-year-old graphic designer in Tehran, the impact was already visible: The price tag on the furniture for her new home jumped higher within three days. "Even before the dollar went up, prices were rising. From meat to taxis, life is already harder," she said. Iran 's government condemned as "unjustifiable" the reinstatement