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  1. Simultaneous system
  2. Alternate system
  3. Simple progressive system
  4. Flexible progressive system
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Option 4 : Flexible progressive system

i) Simultaneous System: All signals with same cycle length & divisions, operated simultaneously.

ii) Alternate system: All signals with same cycle length & divisions, operated alternatively.

iii) Simple Progressive system: Each signal with different cycle length & divisions, which are fixed.

iv) Flexible Progressive system: Each signal with varying cycle length & divisions.
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