A mastaba is:
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http://en.wikipedia.org/wiki/Mastaba
a MASTABA is a type of ancient Egyptian tomb in the form of a flat-roofed, rectangular structure with outward sloping sides that marked the burial site of many prominent Egyptians of the country's ancient period. Mastabas were made of mud-bricks or stone. Previously, the kings started being buried in pyramids as opposed to mastabas. Non-royal use of mastabas continued for more than a thousand years