Order of products to form System Matrix

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Can anyone help explain why does the System Matrix start from the Last process to the first process?

Example:

  • Process 1: T1
  • Process 2: S1
  • Process 3: T2
  • Process 4: S2
  • Process 5: T3

System matrix = product of all process = T3.S2.T2.S1.T1

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