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1a. List the tools used to construct data flow diagrams: 1b. State the seven rules governing the construction of data flow diagrams (DFD): 1c. DFD

1a. List the tools used to construct data flow diagrams:

1b. State the seven rules governing the construction of data flow diagrams (DFD):

1c. DFD consists of four (4) elements, explain them in brief

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