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Step 3

Finally, form the table:

projSName(SUPPLIERS/TYPE) - projSName (R)

That is, subtract the table in Step 2 from the first column of the SUPPLIERS/TYPE table. This gives the suppliers that supply all four types of wood, as Table B-6 illustrates.

Table B-6. SUPPLIER/TYPE ÷ WOOD

SName

Jones Wood Supply

Orange Coast


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