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   Count the number of odd and even numbered thrusters in use. 
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   Form:
   [nOdd, nEven] = OddEven( thrusterIDs )
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   Inputs
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   thrusterIDs  (n)   Array of the thruster ID numbers

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   Outputs
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   nOdd         (1,1) Number of odd thrusters
   nEven        (1,1) Number of even thrusters

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