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We give an algorithm for tiling a simple polygon with rectangles , each of which has at least one integer side . It consists of two parts , each of which has the same weight . Two operating systems are likely candidates for testing and devlopment , each of which has distinct advantages . Structurally , the CALS table model presumes that tables are made up of an optional title plus one or more TGROUPs , each of which has its own body ( TBODY ) and its own independent set of optional column headings ( THEAD ) and footings ( TFOOT ) . The command and service module control system consisted of four individual assemblies , each of which had four engines and a separate propellant feed system . The crystallized mass was then placed in large barrels ( hogsheads ) , each of which had several holes at the bottom that allowed the molasses to drain out . It was thought to threaten the principles of the ancient physician Galen , who believed that health depended on the balance in the body of four elements , or humours : blood , phlegm , choler ( yellow bile ) and melancholy ( black bile ) , each of which had various properties combining heat or cold with wetness or dryness . This extends the old result of de Bruijn which states that a rectangle R can be tiled with rectangles , each of which has an integer side , if and only if R has an integer side . And he had not raised his voice when he had been ordered away from three little protective piles of earth and stone , each of which had been an engineer - ing feat worthy of being made sacred to the name of his grandmother .