Sentence reordering

a)  for their rulers / their best known / pyramids / perhaps / their / achievements are / tombs / built.

b)  for / been preserved / stone structures / have / by/ the dry / the gigantic / climate / about 4,500 years.

  1. Perhaps their best known achievements are their pyramids tombs built for their rulers.
  2. The gigantic stone structures have been preserved for about 4500 years by the dry climate.

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