Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

[EX Q]: Paragraph- Sent 1: Tommy and Suzy (brother and sister) went to the playground one afternoon with their mom and dad, Jan and Dean.
Sent 2: They were playing a game of tag and having the best time ever running after each other and laughing.
Sent 3: They liked to play tag instead of building sandcastles or swinging.
Sent 4: They liked tag because they liked to run.
Sent 5: They like to play hopscotch or jump rope but that day they wanted to play tag.
Sent 6: Other games aren't as fun.
Sent 7: They met Tony and Ally (who are best friends) and invited them to play tag too.
Sent 8: Tony and Ally like to play other games like hopscotch or jump rope but that day they joined the game of tag.
Sent 9: Making new friends is important.
Sent 10: Tony and Ally would rather make friends than play their favorite games.
Question: Which game Tommy and Suzy liked playing?.
[EX A]: Tag.

[EX Q]: Paragraph- Sent 1: But I think it is certain that most of the early Christians understood these words of our Lord's ascension and coming again in glory.
Sent 2: They believed that He was coming again in a very little while during their own life-time, in a few months or years, to make an end of the world and to judge the quick and the dead.
Sent 3: And as they waited for His coming, one generation after another, and yet He did not come, a sadness fell upon them.
Sent 4: Christ seemed to have left the world.
Sent 5: The little while that He had promised to be away seemed to have become a very long while.
Sent 6: Hundreds of years passed, and yet Christ did not come in glory.
Sent 7: And, as I said, a sadness fell on all the Church.
Sent 8: Surely, they said, this is the time of which Christ said we were to weep and lament till we saw Him again--this is the time of which He said that the bridegroom should be taken from us, and we should fast in those days.
Sent 9: And they did fast, and weep, and lament; and their religion became a very sad and melancholy one--most sad in those who were most holy, and loved their Lord best, and longed most for His coming in glory.
Question: Who had been waiting for hundreds of years after the Lord's ascension?.
[EX A]: The early Christians.

[EX Q]: Paragraph- Sent 1: The inhabited history of the Las Vegas Valley stretches to 23,000 b.c.
Sent 2: , when much of the area was covered by a prehistoric lake.
Sent 3: During this period, the indigenous people lived in caves, hunting the mammals that gathered at the shoreline.
Sent 4: The landscape of the valley changed dramatically over the next 200 centuries.
Sent 5: The glaciers feeding the lake melted away and the lake evaporated.
Sent 6: Fossils tell an obscure story of man's slow and sporadic development.
Sent 7: Around 3000 b.c.
Sent 8: , native Archaic Indians began to develop a lasting hunting and gathering culture.
Sent 9: By this time, the valley was in much the same geographic state as it exists in today, with one exceptionthe presence of artesian springs that bubbled to the surface in several areas.
Sent 10: These springs fed a network of streams draining through the Las Vegas Wash to the Colorado River.
Sent 11: The areas surrounding the springs were desert oases: sprawling collections of grasses, trees, and wildlife.
Sent 12: Many springs lay in areas that would eventually become the center of the modern Las Vegas metropolis.
Sent 13: For about 4000 years, the Archaics thrived in a culture that included many signs of early civilization.
Sent 14: Signs of even more advancement appeared halfway through the first millennium a.d.
Sent 15: , when the Anasazi Indians inhabited the valley.
Sent 16: Far more progressive than the Archaics, the Anasazi utilized such formal agricultural techniques as irrigation to assist their harvest.
Sent 17: This permitted the Anasazi to achieve a benchmark of advanced societythe ability to live in permanent shelters year-round without need to follow wildlife.
Sent 18: Mysteriously, the Anasazi vanished from the valley around a.d.
Question: How long did the Anasazi inhabit the Las Vegas Valley?.
[EX A]:
4000 years.