I want to know the answer to the following question:
In which city was evidence of pre-Uthmanic Quranic writing discovered in 1972?
All the background I'm provided with is that "In 1972, in a mosque in the city of Sana'a, Yemen, manuscripts were discovered that were later proved to be the most ancient Quranic text known to exist at the time.". Is that enough to answer the question?