because there are more peasants than any kings, knights or lords. kings are the least populus.
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A system of trading loyalties for protectionin the middle ages.
real number system (diagram) and explain it
Class diagram represent generalized view of system while object diagram represent view of a system at a particular instant.
An entity-relationship diagram of a grading system can be viewed by visiting this website at http://stackoverflow.com/questions/9486156/er-diagram-for-grading-system. There is information included with the diagram about the grading system.
A system diagram is known as a first level DFD (Level 0 DFD) A data flow diagram (DFD) is a graphical representation of the "flow" of data through an information system.